Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements Of Comprehensive Income [Abstract]
Net income (loss)	$ 22,817	$ (31,901)	$ 63,933
Other comprehensive income (loss):
Foreign currency translation adjustments	(2,273)	4,977	(1,465)
Unrealized gain on investments, net of tax	41	33	21
Unrealized gain (loss) on derivative, net of tax	(1,362)	1,192	286
Other	619	(175)	(2)
Other comprehensive gain (loss)	(2,975)	6,027	(1,160)
Comprehensive income (loss)	$ 19,842	$ (25,874)	$ 62,773