Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	[1]
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (78,868)	$ 928	$ (87,443)	$ 8,987
Other comprehensive (loss) income:
Unrealized (loss) gain on available-for-sale securities, net of income tax expense (benefit) of $1, $11, $6 and $(7)	(9)	34	6	(3)
(Loss) gain on derivative securities, effective portion, net of income tax expense (benefit) of $(106), $4, $(139) and $32	(123)	12	(223)	156
Foreign currency translation, net of income tax expense (benefit) of $(9), $3, $(64) and $0	72	(338)	200	(455)
Net other comprehensive income (loss) during period	(60)	(292)	(17)	(302)
Comprehensive (loss) income	$ (78,928)	$ 636	$ (87,460)	$ 8,685

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