Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 7,594	$ 3,728	$ 22,568	$ 16,884
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities, net of income tax expense of $0, $9, $16 and $14	0	10	26	23
Income (loss) on derivative securities, effective portion, net of income tax benefit (expense) of $(150), $0, $326 and $0	248	0	(539)	0
Foreign currency translation, net of income tax (benefit) expense of $(1), $5, $(6) and $9	(45)	(451)	397	(803)
Net other comprehensive income (loss) during period	203	(441)	(116)	(780)
Comprehensive income	$ 7,797	$ 3,287	$ 22,452	$ 16,104