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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2013
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

The following table shows the carrying value and related fair value of financial instruments that are not recorded in the financial statements at fair value as of December 31, 2013 and 2012 (in thousands):

 
  December 31, 2013   December 31, 2012  
 
  Carrying
Value
  Fair
Value
  Carrying
Value
  Fair
Value
 

Long-term debt

  $ 3,023,071   $ 3,079,460   $ 2,523,051   $ 2,763,080  

SMR Liability

    89,592     120,922     91,851     130,736