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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value of Long-Term Debt
     March 31, 2013      December 31, 2012  
     Recorded
Amount
     Fair Value      Recorded
Amount
     Fair Value  
     (In thousands)  

Long-term debt

   $ 695,820       $ 754,802       $ 699,288       $ 764,784