Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income	$ 70,091	$ 153,590	$ 212,396	$ 531,182
Other comprehensive income (loss), net of tax (Note 11):
Net foreign currency translation adjustments	(120)	(186)	(88)	(186)
Unrealized gains (losses) on investments:
Unrealized holding gains (losses) arising during the period	4,012	(798)	(11,154)	10,504
Less: Reclassification adjustment for net (losses) gains included in net income	(223)	(418)	44,408	(807)
Net unrealized gains (losses) on investments	4,235	(380)	(55,562)	11,311
Activity related to investments recorded as assets held for sale	0	(1,437)	(3,254)	506
Other comprehensive income (loss), net of tax	4,115	(2,003)	(58,904)	11,631
Comprehensive income	$ 74,206	$ 151,587	$ 153,492	$ 542,813