CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 11,280	$ 6,738
Other comprehensive income, net of tax:
Foreign currency translation adjustment	52	137
Unrealized gains on available-for-sale securities	8	0
Comprehensive income	$ 11,340	$ 6,875