Fair Value Measurements (Schedule of Fair Value of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives		$ 1
Liability Derivatives	(4,597)	(4,251)
Total derivatives	(4,597)	(4,250)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	(4,597)	(4,251)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives		1
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives		1
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (4,597)	$ (4,251)