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Derivative financial instruments (Notional amounts and fair values of derivatives outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Total derivative assets    
Derivative assets, fair value $ 3,303 $ 11,664
Total derivative liabilities    
Derivative liabilities, fair value 167,303 97,066
Not Designated as Hedging Instrument | Interest rate caps    
Total derivative assets    
Derivative assets, notional amount 3,022,000 2,442,000
Derivative assets, fair value 2,790 3,727
Not Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedging    
Total derivative liabilities    
Derivative liabilities, notional amount 400,000 0
Derivative liabilities, fair value 14,933 0
Designated as Hedging Instrument | Interest rate caps    
Total derivative assets    
Derivative assets, notional amount 475,000 400,000
Derivative assets, fair value 513 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 3,331,000 3,776,000
Derivative liabilities, fair value $ 152,370 $ 97,066