Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 59,848	$ (92,800)	$ 14,658
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized (loss) gain on marketable securities, net of income tax expense of $0, $6 and $13	(4)	6	58
(Loss) gain on derivative securities, effective portion, net of income tax benefit of $0, $139 and $17	0
(Loss) gain on derivative securities, effective portion, net of income tax benefit of $0, $139 and $17		(223)	7
Foreign currency translation adjustment, net of income tax benefit of $32, $27 and $2	955	189	(715)
Other comprehensive income (loss)	951	(28)	(650)
Comprehensive income (loss)	$ 60,799	$ (92,828)	$ 14,008