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Debt and Credit Agreements (Details) (USD $)
 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
7.33% Weighted-Average Fixed Rate Notes
Dec. 31, 2011
7.33% Weighted-Average Fixed Rate Notes
Dec. 31, 2012
6.51% Weighted-Average Fixed Rate Notes
Dec. 31, 2011
6.51% Weighted-Average Fixed Rate Notes
Dec. 31, 2008
9.78% Notes
Dec. 31, 2012
9.78% Notes
Dec. 31, 2011
9.78% Notes
Dec. 31, 2012
5.58% Weighted-Average Fixed Rate Notes
Dec. 31, 2011
5.58% Weighted-Average Fixed Rate Notes
Dec. 31, 2012
Revolving Credit Facility
May 31, 2012
Revolving Credit Facility
Dec. 31, 2011
Revolving Credit Facility
Dec. 31, 2012
Senior Notes
Greater than
Debt                              
Credit Facility     $ 95,000,000 $ 95,000,000 $ 425,000,000 $ 425,000,000   $ 67,000,000 $ 67,000,000 $ 175,000,000 $ 175,000,000 $ 325,000,000   $ 188,000,000  
Current portion of long-term debt (75,000,000)   (75,000,000)                        
Long-Term Debt, excluding Current Maturities 1,012,000,000 950,000,000                          
Weighted-average interest rate (as a percent)     7.33% 7.33% 6.51% 6.51%       5.58% 5.58% 2.20%   4.90%  
Interest rate (as a percent)             9.78% 9.78% 9.78%            
Availability under the credit facility                       574,000,000      
Debt due in 2013 75,000,000                            
Debt due in 2016 20,000,000                            
Debt due in 2018 245,000,000                            
Maturity period of debt             10 years                
Asset coverage ratio after amendment                             1.75
Capitalized debt issuance costs, as amended September 2010                       5,000,000 5,000,000    
Line of credit, outstanding                       $ 325,000,000   $ 188,000,000