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Derivative financial instruments (Notional amounts and fair values of derivatives outstanding) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Total derivative assets |  |
Derivative assets, fair value | $ 1,852 | $ 11,664
Total derivative liabilities |  |
Derivative liabilities, fair value | 200,014 | 97,066
Not Designated as Hedging Instrument | Interest rate caps |  |
Total derivative assets |  |
Derivative assets, notional amount | 2,644,500 | 2,442,000
Derivative assets, fair value | 1,124 | 3,727
Not Designated as Hedging Instrument | Interest rate swaps |  |
Total derivative liabilities |  |
Derivative liabilities, notional amount | 300,000 | 0
Derivative liabilities, fair value | 16,652 | 0
Designated as Hedging Instrument | Interest rate caps |  |
Total derivative assets |  |
Derivative assets, notional amount | 400,000 | 400,000
Derivative assets, fair value | 728 | 6,359
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedging |  |
Total derivative assets |  |
Derivative assets, notional amount | 0 | 488,616
Derivative assets, fair value | 0 | 1,578
Total derivative liabilities |  |
Derivative liabilities, notional amount | 3,602,217 | 3,776,000
Derivative liabilities, fair value | $ 183,362 | $ 97,066

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