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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2011
Summary of Significant Accounting Policies  
Schedule of the carrying value and related fair value of financial instruments that are not recorded in the financial statements at fair value
 
  December 31, 2011   December 31, 2010  
 
  Carrying Value   Fair Value   Carrying Value   Fair Value  

Long-term debt

  $ 1,846,062   $ 1,880,710   $ 1,273,434   $ 1,333,875  

SMR Liability

    93,909     119,887     95,784     125,600