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Long-Term Debt (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Debt Instrument [Line Items]          
Remaining outstanding principal $ 7,910,721,000   $ 7,910,721,000   $ 8,129,546,000
Losses on early extinguishment of debt   159,780,000   159,780,000  
Bridge loan facility 1,900,000,000   1,900,000,000    
Commitments fees related to bridge loan facility 7,500,000   15,000,000    
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   4 years    
Senior Unsecured Debt [Member]
         
Debt Instrument [Line Items]          
Remaining outstanding principal 7,878,316,000   7,878,316,000   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    
Debt instrument, maturity date Dec. 15, 2019        
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) 0.40%        
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%