Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 92,257	$ 202,759
Other comprehensive income, net of tax (see Note 11):
Net foreign currency translation adjustments	(126)	0
Unrealized gains on investments:
Unrealized holding gains arising during the period	6,454	2,669
Less: Reclassification adjustment for net (losses) gains included in net income	(33)	4
Net unrealized gains on investments	6,487	2,665
Net unrealized gains on investments recorded as assets held for sale	1,828	1,296
Other comprehensive income, net of tax	8,189	3,961
Comprehensive income	$ 100,446	$ 206,720