Condensed 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	$ 26,111	$ 3,771	$ 61,706	$ 24,669
Other comprehensive income (loss):
Net unrealized gains (losses) on available-for- sale securities, net of tax	(690)	42	(174)	(41)
Other comprehensive income (loss)	(690)	42	(174)	(41)
Comprehensive income	$ 25,421	$ 3,813	$ 61,532	$ 24,628