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Amortizable Intangible Assets - Goodwill and Intangible Assets, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amortizable Intangible assets                      
Gross Carrying Amount $ 59,256       $ 53,178       $ 59,256 $ 53,178  
Accumulated Amortization (34,185)       (28,776)       (34,185) (28,776)  
Amortization of Intangible Assets                 (5,500) (6,000) $ (6,100)
Intangible assets, net 25,071       24,402       25,071 24,402  
Finite-lived Intangible Assets, Purchase Of Intangibles                 2,081    
Goodwill, Other Increase (Decrease)                 320    
Impairment of goodwill 0 $ 0 $ 0 $ 0 6,686 $ 0 $ 0 $ 0 0 6,686 0
Foreign exchange                 10    
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net                 0 0  
2019 5,933               5,933    
2020 5,341               5,341    
2021 3,436               3,436    
2022 2,616               2,616    
2023 1,665               1,665    
Thereafter 5,464               5,464    
Finite-Lived Intangible Assets, Net 24,455               24,455    
Increase (Decrease) in Other Current Assets                 (3,808) 5,297 (2,016)
Patents                      
Amortizable Intangible assets                      
Gross Carrying Amount 4,659       2,109       4,659 2,109 2,350
Accumulated Amortization (561)       (411)       (561) (411) (545)
Amortization of Intangible Assets                 (150) (107)  
Intangible assets, net 4,098       1,698       4,098 1,698 1,805
Finite-lived Intangible Assets Acquired                 2,550    
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross                   (241)  
Accumulated amortization of removal of fully amortized asset                   241  
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net                   0  
Unpatented Technology                      
Amortizable Intangible assets                      
Gross Carrying Amount 21,616       20,662       21,616 20,662 21,667
Accumulated Amortization (14,361)       (12,344)       (14,361) (12,344) (10,979)
Amortization of Intangible Assets                 (2,017) (2,557)  
Intangible assets, net 7,255       8,318       7,255 8,318 10,688
Reclassifications                   (277)  
Foreign exchange                 166 (90)  
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross                   (1,192)  
Accumulated amortization of removal of fully amortized asset                   1,192  
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net                   0  
Noncompete Agreements Trademarks and Other                      
Amortizable Intangible assets                      
Gross Carrying Amount 14,703       12,225       14,703 12,225 12,225
Accumulated Amortization (5,529)       (3,719)       (5,529) (3,719) (2,817)
Amortization of Intangible Assets                 (1,910) (1,757)  
Intangible assets, net 9,174       8,506       9,174 8,506 9,408
Finite-lived Intangible Assets, Purchase Of Intangibles                 2,081    
Finite-lived Intangible Assets Acquired                 6 879  
Reclassifications                 481 (24)  
Foreign exchange                 10    
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross                 (100) (855)  
Accumulated amortization of removal of fully amortized asset                 100 855  
Customer Relationships                      
Amortizable Intangible assets                      
Gross Carrying Amount 17,660       17,563       17,660 17,563 17,678
Accumulated Amortization (13,732)       (12,299)       (13,732) (12,299) (10,869)
Amortization of Intangible Assets                 (1,433) (1,430)  
Intangible assets, net 3,928       5,264       3,928 5,264 $ 6,809
Foreign exchange                 (27) (115)  
North America                      
Amortizable Intangible assets                      
Gross Carrying Amount 33,756       30,825       33,756 30,825  
Accumulated Amortization (19,173)       (16,002)       (19,173) (16,002)  
Intangible assets, net $ 14,583       $ 14,823       14,583 14,823  
Goodwill, Other Increase (Decrease)                 320    
Impairment of goodwill                 0 0  
Increase (Decrease) in Other Current Assets                 (161)    
North America | Noncompete Agreements Trademarks and Other                      
Amortizable Intangible assets                      
Reclassifications                 $ (481)    
Europe | Noncompete Agreements Trademarks and Other                      
Amortizable Intangible assets                      
Reclassifications                   $ (24)  
Maximum                      
Amortizable Intangible assets                      
Finite-Lived Intangible Asset, Useful Life                 21 years    
Minimum                      
Amortizable Intangible assets                      
Finite-Lived Intangible Asset, Useful Life                 3 years