Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative assets (Notional amounts and fair values of derivatives outstanding) (Details)

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Derivative assets (Notional amounts and fair values of derivatives outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Total derivative assets    
Derivative assets, Fair value $ 48,896 $ 37,187
Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]    
Total derivative assets    
Derivative assets, Notional amount [1] 2,721,000 2,911,220
Derivative assets, Fair value 25,021 30,362
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]    
Total derivative assets    
Derivative assets, Notional amount [1] 1,830,785 425,612
Derivative assets, Fair value $ 23,875 $ 6,825
[1] The notional amount is recorded as nil where caps and swaps are not yet effective.