Derivative Instruments (Fair Value Of Derivative Instruments In The Condensed Consolidated Balance Sheets Using Level 2 Inputs) (Details) (Derivatives Designated As Hedging Instruments [Member], Level 2 [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Total fair value of derivative instruments	$ (1,566)	$ (1,183)
Interest Rate Swaps [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Total fair value of derivative instruments	(1,657)	(1,309)
Foreign Currency Forwards [Member] | Prepaid Expenses And Other Current Assets [Member]
Derivative [Line Items]
Total fair value of derivative instruments	$ 91	$ 126