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Fair Value Of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value Of Financial Instruments [Abstract]  
Fair Value Of Long-Term Debt
     March 31, 2012      December 31, 2011  
     Recorded
Amount
     Fair Value      Recorded
Amount
     Fair Value  
     (In thousands)  

Long-term debt

   $ 756,661       $ 818,102       $ 763,673       $ 819,854