Quarterly report pursuant to Section 13 or 15(d)

Derivatives (Details 3)

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Derivatives (Details 3) (USD $)
0 Months Ended 3 Months Ended
Mar. 23, 2012
Mar. 31, 2012
Derivatives    
Gain on early termination of derivative instruments $ 8,451,000 $ 8,451,000
Interest rate swaps (Swaps) | Not designated as hedge
   
Derivatives    
Settlement payments   8,837,000
Unrealized gain (loss) related to the change in fair value of derivatives   $ 6,793,000