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DEBT AND CREDIT AGREEMENTS (Details) (USD $)
Sep. 30, 2013
Apr. 17, 2013
Dec. 31, 2012
Debt      
Current Maturities     $ (75,000,000)
Long-Term Debt, excluding current maturities 1,162,000,000   1,012,000,000
Borrowing base prior to approval   1,700,000,000  
Borrowing base   2,300,000,000  
7.33% weighted-average fixed rate notes
     
Debt      
Total debt 20,000,000   95,000,000
Current Maturities     (75,000,000)
Weighted-average interest rate (as a percent) 7.33%   7.33%
6.51% weighted-average fixed rate notes
     
Debt      
Total debt 425,000,000   425,000,000
Weighted-average interest rate (as a percent) 6.51%   6.51%
9.78% notes
     
Debt      
Total debt 67,000,000   67,000,000
Interest rate (as a percent) 9.78%   9.78%
5.58% weighted-average fixed rate notes
     
Debt      
Total debt 175,000,000   175,000,000
Weighted-average interest rate (as a percent) 5.58%   5.58%
Revolving Credit Facility
     
Debt      
Total debt 475,000,000   325,000,000
Weighted-average interest rate (as a percent) 2.40%    
Availability under the credit facility 424,000,000    
Line of credit $ 900,000,000