CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 7,314	$ 1,891	$ 21,101	$ 11,455
Other comprehensive income:
Unrealized gain (loss) on available-for-sale securities, net of tax	(5)	15	(3)	12
Comprehensive income	$ 7,309	$ 1,906	$ 21,098	$ 11,467