Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps (Details)

v3.3.1.900
Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Notional Amount $ 29,925,251 $ 48,367,024  
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Expense on Interest Rate Swap and Swaption Agreements (85,636) (91,754) $ (58,522)
Derivative, Average Notional Amount $ 16,091,714 $ 23,329,504 $ 16,965,918