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Fair Value (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value [Abstract]  
Contractual over ride and long-term debt
                                 
    Fair Value As Of     Carrying Value As Of  
    March 31, 2012     December 31, 2011     March 31, 2012     December 31, 2011  
    (In thousands)  
    (Unaudited)           (Unaudited)        

Assets

                               

Contractual overriding agreement, current and long-term

  $ 10,291     $ —       $ 8,998     $ —    

Liabilities

                               

Long-term debt, current and long-term

  $ 893,650     $ 915,959     $ 851,878     $ 867,070