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Debt and Credit Agreements (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Debt      
Current Maturities   $ (75,000,000)  
Long-Term Debt, excluding current maturities 1,147,000,000 1,012,000,000  
Debt due in 2016 20,000,000    
Debt due in 2018 312,000,000    
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% 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 460,000,000 325,000,000  
Weighted-average interest rate (as a percent) 2.00% 2.20%  
Availability under the credit facility $ 939,000,000