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Long Term Debt (Details) (USD $)
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Long-term Debt $ 8,326,994,000  
Payments (78,024,000)  
Less: Debt Discount (56,498,000) (63,299,000)
Less: Current Portion (203,659,000) (280,002,000)
Borrowings 0  
Long-term Debt, gross 8,248,970,000  
Interest Rate (in hundredths) 8.00% [1]  
Long-term debt, net 7,988,813,000 7,983,693,000
Principal Payments 2011 (remaining six months) 201,978,000  
Principal Payments 2012 180,366,000  
Principal Payments 2013 709,855,000  
Principal Payments 2014 600,517,000  
Principal Payments 2015 800,549,000  
Principal Payments 2016 466,000  
Rural Utilities Service [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 11,214,000  
Payments (509,000)  
Borrowings 0  
Long-term Debt, gross 10,705,000  
Interest Rate (in hundredths) 6.15% [1]  
Senior Unsecured Debt [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 8,302,230,000  
Payments (77,515,000)  
Borrowings 0  
Long-term Debt, gross 8,224,715,000  
Interest Rate (in hundredths) 8.00% [1]  
Principal Outstanding 8,224,715,000  
Interest Rate, Stated Percentage (in hundredths) 8.00% 8.04%
Senior Unsecured Debt [Member] | Senior Note [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   7,807,284,000
Principal Outstanding 7,729,769,000 7,807,284,000
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 5/15/2011 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   76,089,000
Principal Outstanding 0 76,089,000
Interest Rate, Stated Percentage (in hundredths) 0.00% 9.25%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 10/24/2011 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   200,000,000
Principal Outstanding 200,000,000 200,000,000
Interest Rate, Stated Percentage (in hundredths) 6.27% 6.27%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 12/31/2012 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   144,000,000
Principal Outstanding 143,250,000 144,000,000
Interest Rate, Stated Percentage (in hundredths) 1.625% [2] 1.688% [2]
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 1/15/2013 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   580,724,000
Principal Outstanding 580,724,000 580,724,000
Interest Rate, Stated Percentage (in hundredths) 6.25% 6.25%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 12/31/2013 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   131,288,000
Principal Outstanding 130,612,000 131,288,000
Interest Rate, Stated Percentage (in hundredths) 2.00% [2] 2.063% [2]
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 5/1/2014 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   600,000,000
Principal Outstanding 600,000,000 600,000,000
Interest Rate, Stated Percentage (in hundredths) 8.25% 8.25%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 3/15/2015 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   300,000,000
Principal Outstanding 300,000,000 300,000,000
Interest Rate, Stated Percentage (in hundredths) 6.625% 6.625%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 4/15/2015 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   500,000,000
Principal Outstanding 500,000,000 500,000,000
Interest Rate, Stated Percentage (in hundredths) 7.875% 7.875%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 4/15/2017 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   1,100,000,000
Principal Outstanding 1,100,000,000 1,100,000,000
Interest Rate, Stated Percentage (in hundredths) 8.25% 8.25%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 10/1/2018 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   600,000,000
Principal Outstanding 600,000,000 600,000,000
Interest Rate, Stated Percentage (in hundredths) 8.125% 8.125%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 3/15/2019 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   434,000,000
Principal Outstanding 434,000,000 434,000,000
Interest Rate, Stated Percentage (in hundredths) 7.125% 7.125%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 4/15/2020 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   1,100,000,000
Principal Outstanding 1,100,000,000 1,100,000,000
Interest Rate, Stated Percentage (in hundredths) 8.50% 8.50%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 4/15/2022 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   500,000,000
Principal Outstanding 500,000,000 500,000,000
Interest Rate, Stated Percentage (in hundredths) 8.75% 8.75%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 1/15/2027 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   345,858,000
Principal Outstanding 345,858,000 345,858,000
Interest Rate, Stated Percentage (in hundredths) 7.875% 7.875%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 2/15/2028 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   200,000,000
Principal Outstanding 200,000,000 200,000,000
Interest Rate, Stated Percentage (in hundredths) 6.73% 6.73%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 10/15/2029 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   50,000,000
Principal Outstanding 50,000,000 50,000,000
Interest Rate, Stated Percentage (in hundredths) 8.40% 8.40%
Senior Unsecured Debt [Member] | Senior Note [Member] | Senior Note Due 8/15/2031 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   945,325,000
Principal Outstanding 945,325,000 945,325,000
Interest Rate, Stated Percentage (in hundredths) 9.00% 9.00%
Senior Unsecured Debt [Member] | Debentures [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   458,867,000
Principal Outstanding 458,867,000 458,867,000
Senior Unsecured Debt [Member] | Debentures [Member] | Debenture Due 11/1/2025 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   138,000,000
Principal Outstanding 138,000,000 138,000,000
Interest Rate, Stated Percentage (in hundredths) 7.00% 7.00%
Senior Unsecured Debt [Member] | Debentures [Member] | Debenture Due 8/15/2026 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   1,739,000
Principal Outstanding 1,739,000 1,739,000
Interest Rate, Stated Percentage (in hundredths) 6.80% 6.80%
Senior Unsecured Debt [Member] | Debentures [Member] | Debenture Due 10/1/2034 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   628,000
Principal Outstanding 628,000 628,000
Interest Rate, Stated Percentage (in hundredths) 7.68% 7.68%
Senior Unsecured Debt [Member] | Debentures [Member] | Debenture Due 7/1/2035 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   125,000,000
Principal Outstanding 125,000,000 125,000,000
Interest Rate, Stated Percentage (in hundredths) 7.45% 7.45%
Senior Unsecured Debt [Member] | Debentures [Member] | Debenture Due 10/1/2046 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   193,500,000
Principal Outstanding 193,500,000 193,500,000
Interest Rate, Stated Percentage (in hundredths) 7.05% 7.05%
Senior Unsecured Debt [Member] | Subsidiary Senior Notes Due 12/1/2012 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   36,000,000
Principal Outstanding 36,000,000 36,000,000
Interest Rate, Stated Percentage (in hundredths) 8.05% 8.05%
Senior Unsecured Debt [Member] | Capital Lease Obligations [Member]
   
Debt Instrument [Line Items]    
Long-term Debt   79,000
Principal Outstanding 79,000 79,000
Interest Rate, Stated Percentage (in hundredths) 0.00% 0.00%
Industrial Development Revenue Bonds [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 13,550,000  
Payments 0  
Borrowings 0  
Long-term Debt, gross 13,550,000  
Interest Rate (in hundredths) 6.33% [1]  
Revolving Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Line of credit facility maximum borrowing capacity 750,000,000  
Amount of credit facility outstanding 750,000,000  
Line of credit initiation date March 23, 2010  
Line of credit facility expiration date January 1, 2014  
Associated facility fees under the Credit Facility, percentage (in hundredths) 0.625%  
Unsecured Letter of Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Line of credit facility maximum borrowing capacity 190,000,000  
Amount of credit facility outstanding 190,000,000  
Line of credit initiation date September 8, 2010  
Line of credit facility expiration date September 20, 2011  
Amount of bank option to extend unsecured letter of credit $ 100,000,000  
Expiration date of letter of credit extension September 20, 2012  
[1] Interest rate includes amortization of debt issuance costs, debt premiums or discounts, and deferred gain on interest rate swap terminations. The interest rates at June 30, 2011 represent a weighted average of multiple issuances.
[2] The stated interest rate is variable.