Summary of Significant Accounting Policies - Schedule of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ (20,799)
Other comprehensive income (loss), net of tax	1,719	$ (6,806)	$ (8,592)
Balance	(19,079)	(20,799)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(20,799)	(13,993)
Other comprehensive income before reclassifications		(6,806)
Other comprehensive income (loss), net of tax	1,719	(6,806)
Balance	$ (19,079)	$ (20,799)	$ (13,993)