Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 47,451	$ 103,654	$ 76,238
Foreign currency translation adjustments	(132,445)	(9,276)	131,861
Comprehensive (loss) income	$ (84,994)	$ 94,378	$ 208,099