Derivative Instruments Gain (Loss) Hedging Relationship, Income Statement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Interest income and other, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income on derivative	$ (89)	$ 834	$ 503	$ 1,949
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive Income (OCI) on derivative (effective portion)	(2,117)	(270)	(417)	(105)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Interest income and other, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income derivative (Ineffective portion and amount excluded from effectiveness testing)	492	764	1,157	1,113
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | General and administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated OCI into income (effective portion)	$ (1,428)	$ 90	$ (2,715)	$ 66
Maximum [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative maturity period (days/months)			12 months
Maximum [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative maturity period (days/months)	90 days