Derivative Instruments And Hedging Activities (Fair Values Of Derivative Instruments On Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative assets	$ 4,823	$ 4,297
Derivative liabilities	(1,932)	(4,542)
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	3,805	2,690
Derivative liabilities	(1,153)	(3,777)
Derivatives Designated As Hedging Instruments [Member] | Foreign Exchange Contract - Short-Term [Member] | Prepaid Expenses And Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2,558	2,500
Derivatives Designated As Hedging Instruments [Member] | Foreign Exchange Contract - Short-Term [Member] | Accrued Expenses And Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(422)	(2,007)
Derivatives Designated As Hedging Instruments [Member] | Foreign Exchange Contracts - Long-Term [Member] | Other Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1,247	190
Derivatives Designated As Hedging Instruments [Member] | Foreign Exchange Contracts - Long-Term [Member] | Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(731)	(1,770)
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1,018	1,607
Derivative liabilities	(779)	(765)
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contract - Short-Term [Member] | Prepaid Expenses And Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1,018	1,607
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contract - Short-Term [Member] | Accrued Expenses And Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (779)	$ (765)