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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets      
Payments to Acquire Intangible Assets $ 2,775 $ 2,500 $ 0
Goodwill, Gross      
Balance, beginning of period 227,224 58,397  
Additions 0 147,845  
Purchase accounting adjustments 4,627 (1,865)  
Foreign currency fluctuations (10,141) 22,847  
Balance, end of period 221,710 227,224 58,397
Accumulated Impairment Losses      
Balance, beginning of period (41,180) (37,332)  
Foreign currency fluctuations (2,142) (3,848)  
Balance, end of period (39,038) (41,180) (37,332)
Goodwill, Net      
Balance, beginning of period 186,044 21,065  
Additions 0 147,845  
Purchase accounting adjustments 4,627 (1,865)  
Foreign currency fluctuations (8,000) 18,999  
Balance, end of period 182,671 186,044 21,065
Acquired Finite-lived Intangible Assets      
Original cost 191,087 195,912  
Accumulated amortization (44,541) (23,565)  
Intangible Assets, Net 146,546 172,347  
Amortization of Intangible Assets 22,129 17,054 $ 409
Estimated aggregate amortization expense of Intangible Assets      
2019 21,297    
2020 19,873    
2021 18,092    
2022 15,913    
2023 14,352    
Thereafter 57,019    
Total 146,546    
Customer Lists      
Acquired Finite-lived Intangible Assets      
Original cost 143,059 149,355  
Accumulated amortization (33,714) (17,870)  
Intangible Assets, Net $ 109,345 $ 131,485  
Weighted-average original life (in years) 15 years 15 years  
Trade Name      
Acquired Finite-lived Intangible Assets      
Original cost $ 30,592 $ 31,968  
Accumulated amortization (5,327) (2,436)  
Intangible Assets, Net $ 25,265 $ 29,532  
Weighted-average original life (in years) 10 years 10 years  
Technology      
Acquired Finite-Lived Intangible Assets      
Payments to Acquire Intangible Assets $ 2,775    
Acquired Finite-lived Intangible Assets      
Original cost 17,436 $ 14,589  
Accumulated amortization (5,500) (3,259)  
Intangible Assets, Net $ 11,936 $ 11,330  
Weighted-average original life (in years) 10 years 11 years