Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 14,658	$ 26,267	[1],[2]	$ 34,178	[1],[2]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gain (loss) on marketable securities, net of income tax expense (benefit) of $13, $(27), and $5	58	(56)	[3]	8	[3]
Gain (loss) on derivative securities, effective portion, net of income tax expense (benefit) of $(17), $171, and $(14)	7	240	[3]	(24)	[3]
Foreign currency translation adjustment, net of income tax expense (benefit) of $(2), $1, and $(5)	(715)	774	[3]	126	[3]
Other comprehensive income (loss)	(650)	958	[3]	110	[3]
Comprehensive income	$ 14,008	$ 27,225	[3]	$ 34,288	[3]

[1] See Note 4.

[2] See Note 4.

[3] See Note 4.