Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income (loss)	$ 286,924	$ 959,517	$ (196,985)
Foreign currency translation adjustments:
Net foreign currency translation adjustments	(217)	(226)	0
Unrealized (losses) gains on investments:
Unrealized holding (losses) gains arising during the period	(22,573)	13,650	19,149
Less: Reclassification adjustment for net (losses) gains included in net income (loss)	44,183	(1,039)	656
Net unrealized gains on investments	(66,756)	14,689	18,493
Activity related to investments recorded as assets held for sale	(3,254)	(302)	2,597
Other comprehensive income, net of tax	(70,227)	14,161	21,090
Comprehensive income (loss)	$ 216,697	$ 973,678	$ (175,895)