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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.

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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