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Long-Term Debt (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Remaining outstanding principal $ 9,445,567,000 $ 9,445,567,000 $ 8,129,546,000
Proceeds from debt, net of issuance costs 1,519,000,000    
Commitments fees related to bridge loan facility 7,500,000 22,500,000  
Bridge Loan Reduction 350,000,000    
Secured Equipment Financing [Member]
     
Debt Instrument [Line Items]      
Interest Rate 0.00% 0.00%  
Secured equipment financing 10,800,000 10,800,000  
Secured equipment financing term   4 years  
Senior Unsecured Debt [Member]
     
Debt Instrument [Line Items]      
Remaining outstanding principal 9,413,941,000 9,413,941,000 8,107,066,000
CoBank Term Loan 2011 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, face amount 575,000,000 575,000,000  
Debt instrument, maturity date Oct. 14, 2016    
Repayment of the outstanding principal balance, quarterly installments amount 14,400,000    
Initial pricing for LIBOR based borrowings (in hundredths) 2.875% 2.875%  
CoBank Term Loan 2014 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, face amount 350,000,000 350,000,000  
Repayment of the outstanding principal balance, quarterly installments amount 8,800,000    
Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Line of credit facility maximum borrowing capacity 750,000,000 750,000,000  
Debt instrument, maturity date May 31, 2018    
Line of credit facility, current borrowings $ 0 $ 0  
Interest Rate (in thousandths) 0.45%    
Minimum [Member] | CoBank Term Loan 2011 [Member] | Base Rate [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 0.875%    
Minimum [Member] | CoBank Term Loan 2011 [Member] | London Interbank Offered Rate (LIBOR) [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 1.875%    
Minimum [Member] | CoBank Term Loan 2014 [Member] | Base Rate [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 0.875%    
Minimum [Member] | CoBank Term Loan 2014 [Member] | London Interbank Offered Rate (LIBOR) [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 1.875%    
Minimum [Member] | Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Initial pricing for LIBOR based borrowings (in hundredths) 1.00% 1.00%  
Minimum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 0.50%    
Minimum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 1.50%    
Maximum [Member] | CoBank Term Loan 2011 [Member] | Base Rate [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 2.875%    
Maximum [Member] | CoBank Term Loan 2011 [Member] | London Interbank Offered Rate (LIBOR) [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 3.875%    
Maximum [Member] | CoBank Term Loan 2014 [Member] | Base Rate [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 2.875%    
Maximum [Member] | CoBank Term Loan 2014 [Member] | London Interbank Offered Rate (LIBOR) [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 3.875%    
Maximum [Member] | Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Initial pricing for LIBOR based borrowings (in hundredths) 2.00% 2.00%  
Maximum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 1.50%    
Maximum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
     
Debt Instrument [Line Items]      
Interest Rate Margin 2.50%