CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 11,950	$ 8,385	$ 33,051	$ 19,840
Other comprehensive income:
Unrealized gain (loss) on available-for-sale securities, net of tax	5	(17)	2	(5)
Comprehensive income	$ 11,955	$ 8,368	$ 33,053	$ 19,835