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 (loss) income	$ (19,162)	$ 8,920	$ 230,139	$ 44,584
Other comprehensive income (loss):
Unrealized (loss) gain on available for sale securities, net of tax	(51)	(96)	137	(233)
Cumulative translation adjustment, net of tax	(433)	291	(1,056)	492
Comprehensive (loss) income	$ (19,646)	$ 9,115	$ 229,220	$ 44,843