CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 4,435	$ (10,667)
Other comprehensive income:
Unrealized gain on marketable securities, net	1	1,226
Less: Realized gain on marketable securities, net	0	(1,151)
Comprehensive income (loss)	$ 4,436	$ (10,592)