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Operations and Summary of Significant Accounting Policies - Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in gross carrying amount of finite-lived intangible assets      
Gross carrying amount, balance at the beginning of the year $ 57,065    
Accumulated amortization, balance at the beginning of the year (29,390)    
Intangible assets, net carrying amount, beginning of period 27,675    
Acquisition   $ 1,062  
Amortization (6,000) (6,100) $ (7,200)
Gross carrying amount, balance at the end of the year 51,442 57,065  
Accumulated amortization, balance at the end of the year (28,578) (29,390)  
Intangible assets, net carrying amount, end of period 22,864 27,675  
Reclassifications of goodwill 439    
Reclassifications (1,512) 0  
Estimated future amortization of intangible assets      
2017 4,728    
2018 3,526    
2019 3,447    
2020 3,416    
2021 2,937    
Thereafter 4,194    
Total 22,248    
Noncompete Agreements Trademarks and Other      
Changes in gross carrying amount of finite-lived intangible assets      
Gross carrying amount, balance at the beginning of the year 10,578 10,839  
Accumulated amortization, balance at the beginning of the year (7,203) (5,374)  
Intangible assets, net carrying amount, beginning of period 3,375 5,465  
Acquisition 1,212 25  
Amortization (2,040) (2,039)  
Reclassifications 119    
Foreign exchange (39) (76)  
Removal of fully amortized asset, gross (5,143) (210)  
Accumulated amortization of removal of fully amortized asset 5,143 210  
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net 0 0  
Gross carrying amount, balance at the end of the year 6,727 10,578 10,839
Accumulated amortization, balance at the end of the year (4,100) (7,203) (5,374)
Intangible assets, net carrying amount, end of period 2,627 3,375 5,465
Patents      
Changes in gross carrying amount of finite-lived intangible assets      
Gross carrying amount, balance at the beginning of the year 1,513 1,758  
Accumulated amortization, balance at the beginning of the year (379) (1,577)  
Intangible assets, net carrying amount, beginning of period 1,134 181  
Amortization (149) (102)  
Reclassifications 212    
Foreign exchange (7) (7)  
Removal of fully amortized asset, gross   (1,300)  
Accumulated amortization of removal of fully amortized asset   1,300  
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net   0  
Gross carrying amount, balance at the end of the year 1,718 1,513 1,758
Accumulated amortization, balance at the end of the year (528) (379) (1,577)
Intangible assets, net carrying amount, end of period 1,190 1,134 181
Unpatented Technology      
Changes in gross carrying amount of finite-lived intangible assets      
Gross carrying amount, balance at the beginning of the year 21,604 22,797  
Accumulated amortization, balance at the beginning of the year (8,656) (7,665)  
Intangible assets, net carrying amount, beginning of period 12,948 15,132  
Amortization (2,058) (2,061)  
Reclassifications 1,512    
Foreign exchange (243) (123)  
Removal of fully amortized asset, gross (1,711) (1,070)  
Accumulated amortization of removal of fully amortized asset 1,711 1,070  
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net 0 0  
Gross carrying amount, balance at the end of the year 21,162 21,604 22,797
Accumulated amortization, balance at the end of the year (9,003) (8,656) (7,665)
Intangible assets, net carrying amount, end of period 12,159 12,948 15,132
Customer Relationships      
Changes in gross carrying amount of finite-lived intangible assets      
Gross carrying amount, balance at the beginning of the year 21,242 21,346  
Accumulated amortization, balance at the beginning of the year (13,152) (11,671)  
Intangible assets, net carrying amount, beginning of period 8,090 9,675  
Acquisition   474  
Amortization (1,793) (1,881)  
Reclassifications 46    
Foreign exchange (71) (178)  
Removal of fully amortized asset, gross   (400)  
Accumulated amortization of removal of fully amortized asset   400  
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net   0  
Gross carrying amount, balance at the end of the year 21,217 21,242 21,346
Accumulated amortization, balance at the end of the year (14,945) (13,152) (11,671)
Intangible assets, net carrying amount, end of period 6,272 8,090 $ 9,675
North America      
Changes in gross carrying amount of finite-lived intangible assets      
Gross carrying amount, balance at the beginning of the year 27,475    
Accumulated amortization, balance at the beginning of the year (14,941)    
Intangible assets, net carrying amount, beginning of period 12,534    
Gross carrying amount, balance at the end of the year 23,562 27,475  
Accumulated amortization, balance at the end of the year (13,811) (14,941)  
Intangible assets, net carrying amount, end of period 9,751 12,534  
Reclassifications of goodwill 439    
In Process Research and Development [Member]      
Changes in gross carrying amount of finite-lived intangible assets      
Reclassifications $ (1,512) $ 0