Fair Value Derivatives, Balance Sheet Location and Notional Value (Details) (USD $) In Thousands, unless otherwise specified													3 Months Ended
	Jun. 30, 2012 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2012 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] Prepaid Expenses and Other Current Assets [Member]	Dec. 31, 2011 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] Prepaid Expenses and Other Current Assets [Member]	Jun. 30, 2012 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses and Other Liabilities [Member]	Dec. 31, 2011 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses and Other Liabilities [Member]	Jun. 30, 2012 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2011 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member]	Jun. 30, 2012 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member] Prepaid Expenses and Other Current Assets [Member]	Dec. 31, 2011 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member] Prepaid Expenses and Other Current Assets [Member]	Jun. 30, 2012 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member] Accrued Expenses and Other Liabilities [Member]	Dec. 31, 2011 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member] Accrued Expenses and Other Liabilities [Member]	Jun. 30, 2012 Maximum [Member] Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative maturity period													90 days
Notional amount of derivatives	$ 51,727	$ 64,451					$ 29,544	$ 42,373
Derivative, fair value, net			$ 125	$ 0	$ 182	$ 364			$ 0	$ 0	$ 1,560	$ 4,046