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Derivatives and Hedging Activities (Fair Value Of Derivative Instruments) (Details) (Goldman Sachs [Member], Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value of interest rate swap asset derivatives, not designated as hedging instruments $ 0 $ 0
Accrued Expenses And Oher Noncurrent Liabilities [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value of interest rate swap liability derivatives, not designated as hedging instruments $ 29,548 $ 32,761