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Goodwill, Customer Relationships and Trademarks - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 79,407 $ 79,147
Finite-Lived Intangible Assets [Line Items]    
Total 37,230  
Customer Relationships - Acquired    
Finite-Lived Intangible Assets [Line Items]    
Cost 63,571 63,571
Accumulated amortization (33,812) (31,660)
Total 29,759 31,911
Customer Relationships - Others    
Finite-Lived Intangible Assets [Line Items]    
Cost 4,320 4,320
Accumulated amortization (3,068) (2,708)
Total 1,252 1,612
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Cost 6,770 6,770
Accumulated amortization (551) (431)
Total $ 6,219 $ 6,339