Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ 39,222	$ (26,651)	$ 60,762
Currency translation adjustment, net of tax	(13,483)	10,176	(3,993)
Comprehensive income (loss)	$ 25,739	$ (16,475)	$ 56,769