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Nature of Operations and Summary of Significant Accounting Policies - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Indefinite-lived Intangible Assets [Roll Forward]      
Indefinite-Lived, Gross $ 8,100 $ 8,100  
Acquisition 8,500 0  
Currency translation 271 0  
Indefinite-Lived, Net 16,871 8,100  
Definite-Lived, Gross   101,743 $ 77,052
Acquisitions 75,540 24,691  
Accumulated amortization (56,913) (49,040)  
Currency translation (2,010) (8,073)  
Definite-Lived, Net 118,360 44,630  
Total Intangible Assets, Net $ 135,231 $ 52,730