CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) [Abstract]
Net loss	$ (26,676)		$ (24,570)		$ (70,037)		$ (36,368)
Unrealized (losses) gains on securities, net of tax	(6,994)		2,207		(3,189)		17,876
Reclassification adjustment for realized gains included in net loss	(831)	[1]	(172)	[1]	(997)	[1]	(1,335)	[1]
Comprehensive loss	$ (34,501)		$ (22,535)		$ (74,223)		$ (19,827)

[1] Included in gain on investments, net on our condensed consolidated statement of operations.