CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 211,388	$ 26,201	$ (33,748)
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities, net of tax	775	(97)	(5)
Total comprehensive income (loss)	$ 212,163	$ 26,104	$ (33,753)