Goodwill and Intangible Assets - Schedule of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Intangible assets subject to amortization
Gross carrying amount	$ 236,667	$ 234,533
Accumulated amortization	(92,827)	(88,059)
Foreign currency translation adjustment	(8,195)	(8,249)
Total	135,645	138,225
Intangible assets with indefinite lives
Gross carrying amount	17,083	19,217
Foreign currency translation adjustment	(918)	(997)
Total	16,165	18,220
Total intangible assets, net	$ 151,810	$ 156,445