CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (4,156)	$ (17,859)	$ (25,700)	$ 1,573
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	3,051	3,024	1,194	2,758
Unrealized change in available-for-sale and non-marketable securities	426	251	98	642
Unrealized change in cash flow hedges	(1,363)	(1,204)	(638)	(1,472)
Net change in other comprehensive income (loss), net of tax	2,114	2,071	654	1,928
Comprehensive (loss) income	$ (2,042)	$ (15,788)	$ (25,046)	$ 3,501