Condensed Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (37,638)	$ (29,299)	$ (103,924)	$ (65,836)
Other comprehensive income (loss), net of tax :
Unrealized loss on marketable securities, net of tax	0	0	(3)	(22)
Unrealized gain (loss) on cash flow hedges, net of tax	877	(1,878)	(3,395)	(1,878)
Less: reclassification adjustment for realized losses included in net loss, net of tax	649	0	1,926	0
Other	39		39
Other comprehensive income (loss)	1,565	(1,878)	(1,433)	(1,900)
Comprehensive loss	$ (36,073)	$ (31,177)	$ (105,357)	$ (67,736)