Derivative Instruments (Fair Values Of Derivative Instruments) (Details) (Prepaid Expenses And Other Assets [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Interest Rate Contracts [Member] | Derivatives Designated As Hedges [Member]
Derivative [Line Items]
Asset derivatives, Notional Amount		$ 15,000	$ 30,000
Asset derivatives, Fair Value			1
Forward Currency Exchange Contracts [Member] | Non-Designated Derivatives [Member]
Derivative [Line Items]
Asset derivatives, Notional Amount	76,671	80,375	51,246
Asset derivatives, Fair Value	$ (396)	$ 260	$ (372)