CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net (loss) income	$ (6,107)	$ 23,649	$ (21,543)	$ 19,432
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	1,268	(111)	(1,856)	(266)
Unrealized change in available-for-sale and non-marketable securities	(55)	(214)	(331)	391
Unrealized change in cash flow hedges	(361)	248	727	(268)
Net change in other comprehensive income (loss), net of tax	852	(77)	(1,460)	(143)
Comprehensive (loss) income	$ (5,255)	$ 23,572	$ (23,003)	$ 19,289