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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash Flow Hedges |  |
Interest expense | $ 164,172 | $ 104,617
Trading |  |
Total | 1,573 | (426)
Designated as Hedging Instrument |  |
Fair Value Hedges |  |
Interest recognized on derivatives | (3,827) | 5,853
Hedged items recorded in interest expense | (23,986) | 15,265
Derivatives recorded in interest expense | 23,888 | (15,246)
Trading |  |
Total | (3,925) | 5,872
Trading |  |
Trading |  |
Change in fair value of future interest payments recorded in earnings | 4,202 | (4,755)
Total | 4,202 | (4,755)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income | Designated as Hedging Instrument |  |
Cash Flow Hedges |  |
Interest expense | $ 1,296 | $ (1,543)

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