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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value of Long-Term Debt
     June 30, 2012      December 31, 2011  
     Recorded
Amount
     Fair Value      Recorded
Amount
     Fair Value  
     (In thousands)  

Long-term debt

   $ 754,824       $ 813,920       $ 763,673       $ 819,854