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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Goodwill, Gross          
Balance, beginning of period     $ 227,224    
Purchase accounting adjustments     4,627    
Foreign currency fluctuations     (6,089)    
Balance, end of period $ 225,762   225,762   $ 227,224
Accumulated Impairment Losses          
Balance, beginning of period     (41,180)    
Foreign currency fluctuations     1,133    
Balance, end of period (40,047)   (40,047)   (41,180)
Goodwill, Net          
Balance, beginning of period     186,044    
Purchase accounting adjustments     4,627    
Foreign currency fluctuations     (4,956)    
Balance, end of period 185,715   185,715   186,044
Acquired Finite-lived Intangible Assets          
Original cost 192,114   192,114   195,912
Accumulated amortization (34,440)   (34,440)   (23,565)
Carrying value 157,674   157,674   172,347
Purchase of Intangible Assets     1,195 $ 2,500  
Amortization expense 5,819 $ 3,536 11,657 $ 3,780  
Estimated aggregate amortization expense of Intangible Assets          
Remaining 2018 10,854   10,854    
2019 21,206   21,206    
2020 19,756   19,756    
2021 18,165   18,165    
2022 16,020   16,020    
Thereafter 71,673   71,673    
Total 157,674   157,674    
Customer Lists          
Acquired Finite-lived Intangible Assets          
Original cost 145,455   145,455   149,355
Accumulated amortization (25,990)   (25,990)   (17,870)
Carrying value 119,465   $ 119,465   $ 131,485
Weighted-average original life (in years)     15 years   15 years
Trade Names          
Acquired Finite-lived Intangible Assets          
Original cost 31,105   $ 31,105   $ 31,968
Accumulated amortization (3,894)   (3,894)   (2,436)
Carrying value 27,211   $ 27,211   $ 29,532
Weighted-average original life (in years)     10 years   10 years
Technology          
Acquired Finite-lived Intangible Assets          
Original cost 15,554   $ 15,554   $ 14,589
Accumulated amortization (4,556)   (4,556)   (3,259)
Carrying value $ 10,998   $ 10,998   $ 11,330
Weighted-average original life (in years)     11 years   11 years
Purchase of Intangible Assets     $ 1,000