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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

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- References

No definition available.

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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

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