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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2011
LONG-TERM DEBT  
Individual series of issued Notes
    Principal   Interest Rate   Maturity Date  
 

Series A

   $ 115,000     6.13%     7/4/2017  
 

Series B

     360,000     6.67%     7/4/2020  
 

Series C

     125,000     6.77%     7/4/2022  
                     
 

 

   $ 600,000