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)	$ 26,144	$ 8,587	$ (80,856)
Other comprehensive income (loss):
Unrealized loss on available-for-sale securities	(5,485)	0	0
Reclassification of other-than-temporary loss on available-for-sale securities included in net income (loss)	5,485	0	0
Comprehensive income (loss)	$ 26,144	$ 8,587	$ (80,856)