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USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT, Schedule of Swap Agreements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2010
Dec. 31, 2015
Notional Disclosures [Abstract]        
Notional amount $ 8,050,000 $ 8,050,000    
Derivative instruments unrealized losses to be recognized   19,900    
Interest Rate SWAP Currently-Paying Contracts [Member] | Third Quarter 2016 (Expired July 1, 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 Currently-Paying Contracts [Member] | Fourth Quarter 2017 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 1,500,000 $ 1,500,000    
Average fixed-rate payment requirement 0.79% 0.79%    
Interest Rate SWAP Currently-Paying Contracts [Member] | First Quarter 2018 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 1,700,000 $ 1,700,000    
Average fixed-rate payment requirement 0.76% 0.76%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Second Quarter 2018 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 600,000 $ 600,000    
Average fixed-rate payment requirement 0.79% 0.79%    
Interest Rate SWAP Currently-Paying Contracts [Member] | Second Quarter 2019 [Member]        
Notional Disclosures [Abstract]        
Notional amount $ 450,000 $ 450,000    
Average fixed-rate payment requirement 0.77% 0.77%    
Interest Rate Swap Agreements [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
SWAP agreement notional amount during period $ 950,000 $ 2,450,000 $ 100,000  
SWAP agreement average interest rate during period 0.78% 0.75% 4.09%  
Swap agreement notional amount expiring during period $ 1,100,000 $ 2,800,000    
SWAP agreement average interest rate expiring during period 0.47% 0.50%    
Notional Disclosures [Abstract]        
Payment term of LIBOR interest rate agreement 2 years 3 years 20 years  
Accrued interest $ 14,300 $ 14,300   $ 10,900
Portfolio-Related Secured Borrowings [Member]        
Notional Disclosures [Abstract]        
Accrued interest $ 2,800 $ 2,800   $ 9,300