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Operations and Summary of Significant Accounting Policies - Intangible Assets Indefinite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Indefinite-Lived Intangibles      
Indefinite-Lived Intangibles, Balance at the beginning of the year $ 2,128 $ 2,134  
Reclassifications 1,512 0  
Foreign exchange 0 (6)  
Indefinite-Lived Intangibles, Balance at the end of the year 616 2,128  
Finite-Lived Intangible Assets, Gross 51,442 57,065  
Finite-Lived Intangible Assets, Accumulated Amortization (28,578) (29,390)  
Intangible Assets, Net (Excluding Goodwill) 22,864 27,675  
North America      
Indefinite-Lived Intangibles      
Finite-Lived Intangible Assets, Gross 23,562 27,475  
Finite-Lived Intangible Assets, Accumulated Amortization (13,811) (14,941)  
Intangible Assets, Net (Excluding Goodwill) 9,751 12,534  
Europe      
Indefinite-Lived Intangibles      
Finite-Lived Intangible Assets, Gross 27,880 29,590  
Finite-Lived Intangible Assets, Accumulated Amortization (14,767) (14,449)  
Intangible Assets, Net (Excluding Goodwill) 13,113 15,141  
Customer Relationships      
Indefinite-Lived Intangibles      
Finite-Lived Intangible Assets, Gross 21,217 21,242 $ 21,346
Finite-Lived Intangible Assets, Accumulated Amortization (14,945) (13,152) (11,671)
Intangible Assets, Net (Excluding Goodwill) 6,272 8,090 9,675
Noncompete Agreements Trademarks and Other      
Indefinite-Lived Intangibles      
Finite-Lived Intangible Assets, Gross 6,727 10,578 10,839
Finite-Lived Intangible Assets, Accumulated Amortization (4,100) (7,203) (5,374)
Intangible Assets, Net (Excluding Goodwill) 2,627 3,375 5,465
Unpatented Technology      
Indefinite-Lived Intangibles      
Finite-Lived Intangible Assets, Gross 21,162 21,604 22,797
Finite-Lived Intangible Assets, Accumulated Amortization (9,003) (8,656) (7,665)
Intangible Assets, Net (Excluding Goodwill) 12,159 12,948 $ 15,132
Trade Name      
Indefinite-Lived Intangibles      
Indefinite-Lived Intangibles, Balance at the beginning of the year 616 616  
Reclassifications 0 0  
Foreign exchange 0 0  
Indefinite-Lived Intangibles, Balance at the end of the year 616 616  
IPR&D      
Indefinite-Lived Intangibles      
Indefinite-Lived Intangibles, Balance at the beginning of the year 1,512 1,518  
Reclassifications 1,512 0  
Foreign exchange 0 (6)  
Indefinite-Lived Intangibles, Balance at the end of the year $ 0 $ 1,512