CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,891	$ 3,488	$ 11,455	$ 16,661
Other comprehensive income:
Unrealized gain (loss) on available-for-sale securities, net of tax	15	(35)	12	(19)
Comprehensive income	$ 1,906	$ 3,453	$ 11,467	$ 16,642