Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 50,048	$ 174,833	$ 142,305	$ 377,592
Other comprehensive (loss) income, net of tax (Note 11):
Net foreign currency translation adjustments	158	0	32	0
Unrealized (losses) gains on investments:
Unrealized holding (losses) gains arising during the period	(21,620)	8,633	(15,166)	11,302
Less: Reclassification adjustment for net gains (losses) included in net income	44,664	(393)	44,631	(389)
Net unrealized (losses) gains on investments	(66,284)	9,026	(59,797)	11,691
Net unrealized gains on investments recorded as assets held for sale	(5,082)	647	(3,254)	1,943
Other comprehensive (loss) income, net of tax	(71,208)	9,673	(63,019)	13,634
Comprehensive (loss) income	$ (21,160)	$ 184,506	$ 79,286	$ 391,226