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Derivative Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Effects of derivative instruments        
Reclassification adjustment for losses included in termination of derivative instruments and recognized on derivatives in the statements of income     $ 6,410  
Loss on debt extinguishment and derivative termination
       
Effects of derivative instruments        
Reclassification adjustment for losses included in termination of derivative instruments and recognized on derivatives in the statements of income 10,143   10,143  
Cash Flow Hedging
       
Effects of derivative instruments        
Amount of Loss Recognized on Derivatives in the Statements of Income (11,953) (2,631) (16,169) (8,815)
Cash Flow Hedging | Interest rate contracts | Interest expense
       
Effects of derivative instruments        
Amount of Loss Recognized on Derivatives in the Statements of Income $ (1,810) $ (2,631) $ (6,026) $ (8,815)