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Fair Value Of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Of Financial Instruments 
Fair Value Of Long-Term Debt
     September 30, 2011      December 31, 2010  
     Recorded
Amount
     Fair Value      Recorded
Amount
     Fair Value  
     (In thousands)  

Long-term debt

   $ 891,179       $ 950,074       $ 860,910       $ 879,511