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Goodwill, Customer Relationships and Trademarks - Roll Forward (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 79,147
Additions (Major Working Capital Adjustment) 260
Balance at end of period 79,407
Finite-lived Intangible Assets [Roll Forward]  
Balance at end of period 37,230
Customer Relationships - Acquired  
Finite-lived Intangible Assets [Roll Forward]  
Balance at beginning of period 31,911
Additions (Major Working Capital Adjustment) 0
Amortization expense (2,152)
Balance at end of period 29,759
Customer Relationships - Others  
Finite-lived Intangible Assets [Roll Forward]  
Balance at beginning of period 1,612
Additions (Major Working Capital Adjustment) 0
Amortization expense (360)
Balance at end of period 1,252
Trademarks  
Finite-lived Intangible Assets [Roll Forward]  
Balance at beginning of period 6,339
Additions (Major Working Capital Adjustment) 0
Amortization expense (120)
Balance at end of period 6,219
Cost of Revenue | Customer Contracts  
Finite-lived Intangible Assets [Roll Forward]  
Amortization expense $ (1,100)