Consolidated Statements of Comprehensive Income - 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	$ 25,826	$ 47,919	$ 22,708	$ 34,254
Other comprehensive loss:
Change in unrealized loss on available-for-sale securities, net	(34)		(34)
Other comprehensive loss, net	(34)		(34)
Comprehensive income	$ 25,792	$ 47,919	$ 22,674	$ 34,254