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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Goodwill, Gross      
Balance, beginning of period $ 227,224    
Purchase accounting adjustments 4,627    
Foreign currency fluctuations 7,047    
Balance, end of period 238,898   $ 227,224
Accumulated Impairment Losses      
Balance, beginning of period (41,180)    
Foreign currency fluctuations (1,553)    
Balance, end of period (42,733)   (41,180)
Goodwill, Net      
Balance, beginning of period 186,044    
Purchase accounting adjustments 4,627    
Foreign currency fluctuations 5,494    
Balance, end of period 196,165   186,044
Acquired Finite-lived Intangible Assets      
Original cost 202,808   195,912
Accumulated amortization (30,511)   (23,565)
Carrying value 172,297   172,347
Purchase of Intangible Assets 1,000 $ 2,500  
Amortization expense 5,838 $ 244  
Estimated aggregate amortization expense of Intangible Assets      
Remaining 2018     17,115
2019 22,388    
2020 20,853    
2021 19,170    
2022 16,928    
Thereafter 75,843    
Total 172,297    
Customer Lists      
Acquired Finite-lived Intangible Assets      
Original cost 154,096   149,355
Accumulated amortization (23,303)   (17,870)
Carrying value $ 130,793   $ 131,485
Weighted-average original life (in years) 15 years   15 years
Trade Names      
Acquired Finite-lived Intangible Assets      
Original cost $ 32,818   $ 31,968
Accumulated amortization (3,293)   (2,436)
Carrying value $ 29,525   $ 29,532
Weighted-average original life (in years) 10 years   10 years
Technology      
Acquired Finite-lived Intangible Assets      
Original cost $ 15,894   $ 14,589
Accumulated amortization (3,915)   (3,259)
Carrying value $ 11,979   $ 11,330
Weighted-average original life (in years) 11 years   11 years