Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,530	$ 2,424	$ 14,974	$ 13,156
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities, net of income tax expense of $4, $5, $16 and $5	8	14	26	13
Loss on derivative securities, effective portion, net of income tax benefit of $63, $0, $476 and $0	(105)	0	(787)	0
Foreign currency translation, net of income tax (benefit) expense of $2, $(1), $(5) and $4	(110)	132	442	(352)
Net other comprehensive income (loss) during period	(207)	146	(319)	(339)
Comprehensive income	$ 3,323	$ 2,570	$ 14,655	$ 12,817