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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

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