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Derivative financial instruments (Notional amounts and fair values of derivatives outstanding) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total derivative assets |  |
Derivative assets, fair value | $ 11,664 | $ 69,105
Total derivative liabilities |  |
Derivative liabilities, fair value | 97,066 | 29,321
Not Designated as Hedging Instrument | Interest rate caps |  |
Total derivative assets |  |
Derivative assets, Notional amount | 2,442,000 | 2,523,500
Derivative assets, fair value | 3,727 | 32,547
Designated as Hedging Instrument | Interest rate caps |  |
Total derivative assets |  |
Derivative assets, Notional amount | 400,000 | 0
Derivative assets, fair value | 6,359 | 0
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedging |  |
Total derivative assets |  |
Derivative assets, Notional amount | 488,616 | 1,900,957
Derivative assets, fair value | 1,578 | 36,558
Total derivative liabilities |  |
Derivative liabilities, notional amount | 3,776,000 | 1,375,000
Derivative liabilities, fair value | $ 97,066 | $ 29,321

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