Goodwill and Intangible Assets - Amortization and Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	$ 17,838	$ 26,755
Amortization expense	4,956	5,526	$ 3,859
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2014	4,129
2015	3,720
2016	2,842
2017	2,084
2018	2,084
Thereafter	2,979
Total amortization expense	17,838	26,755
Goodwill [Roll Forward]
Balance at January 1	36,747	40,454
Foreign currency translation adjustment	(5,404)	(3,707)
Balance at December 31	31,343	36,747	40,454
Amortization expense	(4,956)	$ (5,526)	$ (3,859)
Finite-Lived Intangible Assets, Translation Adjustments	$ (3,961)