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Debt and Credit Agreements (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
7.33% weighted-average fixed rate notes
Dec. 31, 2013
7.33% weighted-average fixed rate notes
Mar. 31, 2014
6.51% weighted-average fixed rate notes
Dec. 31, 2013
6.51% weighted-average fixed rate notes
Mar. 31, 2014
9.78% notes
Dec. 31, 2013
9.78% notes
Mar. 31, 2014
5.58% weighted-average fixed rate notes
Dec. 31, 2013
5.58% weighted-average fixed rate notes
Mar. 31, 2014
Revolving Credit Facility
Dec. 31, 2013
Revolving Credit Facility
Apr. 15, 2014
Revolving Credit Facility
Subsequent event
Debt                          
Total debt     $ 20,000,000 $ 20,000,000 $ 425,000,000 $ 425,000,000 $ 67,000,000 $ 67,000,000 $ 175,000,000 $ 175,000,000 $ 535,000,000 $ 460,000,000  
Long-term debt 1,222,000,000 1,147,000,000                 535,000,000    
Weighted-average interest rate (as a percent)     7.33% 7.33% 6.51% 6.51%     5.58% 5.58% 2.20%    
Availability under the credit facility                     864,000,000    
Interest rate (as a percent)             9.78% 9.78%          
Borrowing base prior to approval                         2,300,000,000
Borrowing base                         3,100,000,000
Line of credit                     $ 1,400,000,000