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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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