| 
                Total assets
             | 
                        
                752.6M
             | 
                        
                729.7M
             | 
                        
                634.7M
             | 
                        
                539.6M
             | 
                    
                
                        | 
                Current assets
             | 
                        
                644.5M
             | 
                        
                600.9M
             | 
                        
                554.4M
             | 
                        
                469.6M
             | 
                    
                
                        | 
                Cash
             | 
                        
                14K
             | 
                        
                11K
             | 
                        
                19K
             | 
                        
                237K
             | 
                    
                
                        | 
                Cash equivalents
             | 
                        
                112.4M
             | 
                        
                148.0M
             | 
                        
                114.6M
             | 
                        
                111.9M
             | 
                    
                
                        | 
                Cash and cash equivalents
             | 
                        
                112.4M
             | 
                        
                148.0M
             | 
                        
                114.6M
             | 
                        
                112.1M
             | 
                    
                
                        | 
                Other short term investments
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accounts receivable
             | 
                        
                269.5M
             | 
                        
                193.0M
             | 
                        
                162.9M
             | 
                        
                155.4M
             | 
                    
                
                        | 
                Other receivables
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                417K
             | 
                    
                
                        | 
                Inventory
             | 
                        
                196.0M
             | 
                        
                220.5M
             | 
                        
                234.9M
             | 
                        
                169.1M
             | 
                    
                
                        | 
                Prepaid assets
             | 
                        
                5.6M
             | 
                        
                8.9M
             | 
                        
                8.3M
             | 
                        
                9.4M
             | 
                    
                
                        | 
                Restricted cash
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Assets held for sale
             | 
                        
                10.8M
             | 
                        
                0
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Hedging assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other current assets
             | 
                        
                3.1M
             | 
                        
                754K
             | 
                        
                357K
             | 
                        
                622K
             | 
                    
                
                        | 
                Non current assets
             | 
                        
                108.1M
             | 
                        
                128.9M
             | 
                        
                80.4M
             | 
                        
                70.0M
             | 
                    
                
                        | 
                Properties
             | 
                        
                165.6M
             | 
                        
                144.2M
             | 
                        
                86.7M
             | 
                        
                67.0M
             | 
                    
                
                        | 
                Land and improvements
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Machinery furniture equipment
             | 
                        
                584K
             | 
                        
                86K
             | 
                        
                86K
             | 
                        
                84K
             | 
                    
                
                        | 
                Construction in progress
             | 
                        
                3.5M
             | 
                        
                5.9M
             | 
                        
                6.0M
             | 
                        
                1.3M
             | 
                    
                
                        | 
                Leases
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accumulated depreciation
             | 
                        
                -104.3M
             | 
                        
                -67.6M
             | 
                        
                -42.0M
             | 
                        
                -23.2M
             | 
                    
                
                        | 
                Goodwill
             | 
                        
                60.1M
             | 
                        
                50.9M
             | 
                        
                52.9M
             | 
                        
                42.0M
             | 
                    
                
                        | 
                Investment properties
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Financial assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Intangible assets
             | 
                        
                4.3M
             | 
                        
                3.1M
             | 
                        
                5.3M
             | 
                        
                6.3M
             | 
                    
                
                        | 
                Investments and advances
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current assets
             | 
                        
                1K
             | 
                        
                -1K
             | 
                        
                236K
             | 
                        
                -1K
             | 
                    
                
                        | 
                Total liabilities
             | 
                        
                525.8M
             | 
                        
                541.3M
             | 
                        
                477.0M
             | 
                        
                410.4M
             | 
                    
                
                        | 
                Current liabilities
             | 
                        
                456.9M
             | 
                        
                455.2M
             | 
                        
                411.1M
             | 
                        
                334.5M
             | 
                    
                
                        | 
                Accounts payable
             | 
                        
                367.7M
             | 
                        
                403.2M
             | 
                        
                364.7M
             | 
                        
                282.7M
             | 
                    
                
                        | 
                Accrued expenses
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Short term debt
             | 
                        
                54.7M
             | 
                        
                40.0M
             | 
                        
                33.8M
             | 
                        
                34.3M
             | 
                    
                
                        | 
                Deferred revenue
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Tax payable
             | 
                        
                11.3M
             | 
                        
                4.8M
             | 
                        
                2.4M
             | 
                        
                4.3M
             | 
                    
                
                        | 
                Pensions
             | 
                        
                2.0M
             | 
                        
                1.1M
             | 
                        
                1.1M
             | 
                        
                1.1M
             | 
                    
                
                        | 
                Other current liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                -1K
             | 
                        
                2.8M
             | 
                    
                
                        | 
                Non current liabilities
             | 
                        
                68.9M
             | 
                        
                86.1M
             | 
                        
                65.9M
             | 
                        
                75.9M
             | 
                    
                
                        | 
                Long term provisions
             | 
                        
                4.1M
             | 
                        
                1.8M
             | 
                        
                1.7M
             | 
                        
                1.8M
             | 
                    
                
                        | 
                Long term debt
             | 
                        
                45.5M
             | 
                        
                61.1M
             | 
                        
                44.2M
             | 
                        
                56.6M
             | 
                    
                
                        | 
                Provision for risks and charges
             | 
                        
                16.8M
             | 
                        
                21.9M
             | 
                        
                18.7M
             | 
                        
                15.8M
             | 
                    
                
                        | 
                Deferred liabilities
             | 
                        
                2K
             | 
                        
                9K
             | 
                        
                15K
             | 
                        
                2K
             | 
                    
                
                        | 
                Derivative product liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current liabilities
             | 
                        
                1K
             | 
                        
                -1K
             | 
                        
                2K
             | 
                        
                —
             | 
                    
                
                        | 
                Shareholders equity
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                    
                
                        | 
                Common stock
             | 
                        
                1.6M
             | 
                        
                1.6M
             | 
                        
                1.6M
             | 
                        
                1.6M
             | 
                    
                
                        | 
                Retained earnings
             | 
                        
                35.3M
             | 
                        
                38.4M
             | 
                        
                33.9M
             | 
                        
                30.1M
             | 
                    
                
                        | 
                Other shareholders equity
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Total shareholders equity
             | 
                        
                226.8M
             | 
                        
                188.4M
             | 
                        
                157.8M
             | 
                        
                129.2M
             | 
                    
                
                        | 
                Additional paid in capital
             | 
                        
                47.5M
             | 
                        
                34.3M
             | 
                        
                34.3M
             | 
                        
                34.3M
             | 
                    
                
                        | 
                Treasury stock
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Minority interest
             | 
                        
                2.2M
             | 
                        
                1.1M
             | 
                        
                919K
             | 
                        
                5.5M
             |