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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2011
Long-Term Debt [Abstract]  
Long-term debt
                 
    December 31,
2011		     December 31,
2010		  
    (In thousands)  

$300 million floating rate revolving credit facility, due August 2016

   $ —     $ 94,000  

5.55% senior notes, with semi-annual interest payments in June and December, maturing June 2013

     35,000       35,000  

4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2018

     32,317       37,650  

8.38% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2013, maturing in March 2019

     150,000       150,000  

5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, maturing in July 2020

     69,230       76,923  

5.31% utility local improvement obligation, with annual principal and interest payments, maturing in March 2021

     1,922       2,115  

5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2023

     33,600       36,900  

4.73% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2023

     75,000       —  

5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2024

     195,000       210,000  

8.92% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2014, maturing in March 2024

     50,000       50,000  

5.03% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026

     175,000       —  

5.18% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026

     50,000       —  
   

 

 

    

 

 

  

Total debt

     867,069       692,588  

Less — current portion of long term debt

     (30,801 )      (31,518 ) 
   

 

 

    

 

 

  

Long-term debt

   $ 836,268     $ 661,070  
   

 

 

    

 

 

  
Principal payments due
                         
    Senior Notes     Credit Facility     Total  
    (In thousands)  

2012

   $ 30,801     $ —     $ 30,801  

2013

     87,230       —       87,230  

2014

     80,983       —       80,983  

2015

     80,983       —       80,983  

2016

     80,983       —       80,983  

Thereafter

     506,089       —       506,089  
   

 

 

    

 

 

    

 

 

  
    $ 867,069     $ —     $ 867,069  
   

 

 

    

 

 

    

 

 

  
Summary of the four tranches of senior notes
                                 

Series

  

Amount

     Interest Rate    

Issue Date

    

Maturity

  

H

     $75 million       4.73 %      April 20, 2011       December 1, 2023  

I

     $125 million       5.03 %      April 20, 2011       December 1, 2026  

J

     $50 million       5.03 %      June 15, 2011       December 1, 2026  

K

     $50 million       5.18 %      October 3, 2011       December 1, 2026