Fair Value Derivatives, Balance Sheet Location and Notional Value (Details) (Foreign Exchange Contract [Member], USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives	$ 31,578	$ 30,701
Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0	440
Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	1,857	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives	77,533	68,788
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0	691
Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 2,695	$ 0