Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income (loss)	$ 202,759	$ (187,500)
Unrealized gains on investments:
Unrealized holding gains arising during the period	4,485	7,466
Less: Reclassification adjustment for net gains included in net income (loss)	524	21
Net unrealized gains on investments	3,961	7,445
Other comprehensive income	3,961	7,445
Comprehensive income (loss)	$ 206,720	$ (180,055)