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USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Schedule of Swap Agreements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2010
Dec. 31, 2014
Notional Disclosures [Abstract]        
Notional amount $ 8,400,000 $ 8,400,000    
Derivative instruments unrealized losses to be recognized   17,600    
Interest Rate SWAP Currently-Paying Contracts [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 7,800,000 $ 7,800,000    
Average-fixed rate payment requirement 0.58% 0.58%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Fourth Quarter 2015 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 1,200,000 $ 1,200,000    
Average-fixed rate payment requirement 0.45% 0.45%    
Interest Rate SWAP Currently-Paying Contracts [Member] | First Quarter 2016 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 1,700,000 $ 1,700,000    
Average-fixed rate payment requirement 0.51% 0.51%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Second Quarter 2016 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 1,100,000 $ 1,100,000    
Average-fixed rate payment requirement 0.47% 0.47%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Third Quarter 2016 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 700,000 $ 700,000    
Average-fixed rate payment requirement 0.56% 0.56%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Fourth Quarter 2016 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 800,000 $ 800,000    
Average-fixed rate payment requirement 0.66% 0.66%    
Interest Rate SWAP Currently-Paying Contracts [Member] | First Quarter 2017 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 1,000,000 $ 1,000,000    
Average-fixed rate payment requirement 0.72% 0.72%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Second Quarter 2017 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 900,000 $ 900,000    
Average-fixed rate payment requirement 0.74% 0.74%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Third Quarter 2017 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 400,000 $ 400,000    
Average-fixed rate payment requirement 0.74% 0.74%    
Interest Rate SWAP Forward-Starting Contracts [Member] | Fourth Quarter 2017 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 600,000 $ 600,000    
Average-fixed rate payment requirement 0.83% 0.83%    
Interest Rate Swap Agreements [Member]        
Derivative Instruments And Hedging Activities [Line Items]        
SWAP agreement notional amount during period $ 1,000,000 $ 2,400,000 $ 100,000  
SWAP agreement average interest rate during period 0.80% 0.76% 4.09%  
Swap agreement notional amount expiring during period $ 400,000 $ 1,700,000    
SWAP agreement average interest rate expiring during period 0.47% 0.49%    
Notional Disclosures [Abstract]        
Payment term of LIBOR interest rate agreement   2 years 20 years  
Accrued interest $ 9,500 $ 9,500   $ 9,500
Portfolio-Related Secured Borrowings [Member]        
Notional Disclosures [Abstract]        
Accrued interest $ 8,500 $ 8,500   $ 6,100