CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 6,531	$ (48,481)	$ (83,147)
Other comprehensive (loss) income:
Foreign currency translation loss		(6)
Unrealized gain (loss) on restricted investments and marketable securities, net of tax	(794)	(172)	115
Reclassification adjustment for realized gains on marketable securities	(1,830)
Other comprehensive (loss) income	(2,624)	(178)	115
Comprehensive income (loss)	$ 3,907	$ (48,659)	$ (83,032)