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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value of Financial Instruments [Abstract] 
Fair value and carrying value of the financial instruments
                                 
    September 30, 2011   December 31, 2010
    Carrying Value   Estimated Fair Value   Carrying Value   Estimated Fair Value
    (In thousands)
 
Cash and cash equivalents
  $ 53,534     $ 53,534     $ 59,930     $ 59,930  
Revolving credit facility
    295,000       295,000       10,000       9,873  
2016 Notes
                332,665       341,813  
2018 Notes
    249,525       252,020       249,525       254,516  
2021 Notes
    360,000       352,800