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 income (loss)	$ 2,384	$ (4,156)	$ (9,001)	$ (25,700)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	(6,500)	3,051	(6,958)	1,194
Unrealized change in available-for-sale and non-marketable securities (net of tax of $(25) and $230 for the three and nine months ended September 30, 2014, respectively; net of $0 tax in each of the three and nine months ended September 30, 2013)	(195)	426	226	98
Unrealized change in cash flow hedges (net of tax of $154 for the three and nine months ended September 30, 2014; net of $0 tax in each of the three and nine months ended September 30, 2013)	1,328	(1,363)	1,806	(638)
Net change in other comprehensive (loss) income, net of tax	(5,367)	2,114	(4,926)	654
Comprehensive loss	$ (2,983)	$ (2,042)	$ (13,927)	$ (25,046)