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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Cash Flow Hedges
Interest expense	$ 140,964	$ 84,163	$ 366,942	$ 217,777
Trading
Total	(1,665)	(188)	(10,882)	(15,016)
Designated as Hedging Instrument
Fair Value Hedges
Hedged items recorded in interest expense	4,809	3,294	27,526	2,673
Derivatives recorded in interest expense	(4,896)	(546)	(27,774)	(7,803)
Trading
Total	(87)	2,748	(248)	(5,130)
Trading
Trading
Change in fair value of future interest payments recorded in earnings	(1,557)	(247)	(8,492)	(1,189)
Total	(1,557)	(247)	(8,492)	(1,189)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Designated as Hedging Instrument
Cash Flow Hedges
Interest expense	$ (21)	$ (2,689)	$ (2,142)	$ (8,697)

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Derivative Instruments Increase (Decrease) In Fair Value Of Future Interest Payments Recorded In Earnings

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