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Derivatives And Hedging Activities (Fair Value Of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Mortgage Loan Interest Rate Swap [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value of interest rate swap asset derivatives, designated as hedging instruments $ 0 $ 0
Mortgage Loan Interest Rate Swap [Member] | Accrued Expenses And Other Noncurrent Liabilities [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value of interest rate swap liability derivatives, designated as hedging instruments 3,692 2,656
Goldman Sachs Interest Rate Swap [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value of interest rate swap asset derivatives, not designated as hedging instruments 0 0
Goldman Sachs Interest Rate Swap [Member] | Accrued Expenses And Other Noncurrent Liabilities [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value of interest rate swap liability derivatives, not designated as hedging instruments $ 32,098 $ 19,456