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

Long-term debt

   $ 699,288       $ 764,784       $ 763,673       $ 819,854