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Geographic information (Lease revenues by individual countries) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Lease revenue | $ 4,713,802 | $ 4,867,623 | $ 4,991,551
Geographic Concentration Risk | Total Lease Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of lease revenue | 100.00% | 100.00% | 100.00%
China |  |  |
Segment Reporting Information [Line Items] |  |  |
Lease revenue | $ 648,343 | $ 669,859 | $ 656,809
China | Geographic Concentration Risk | Total Lease Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of lease revenue | 13.80% | 13.80% | 13.20%
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Lease revenue | $ 568,999 | $ 535,526 | $ 538,686
United States | Geographic Concentration Risk | Total Lease Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of lease revenue | 12.10% | 11.00% | 10.80%
Ireland |  |  |
Segment Reporting Information [Line Items] |  |  |
Lease revenue | $ 120,500 | $ 117,259 | $ 58,571
Ireland | Geographic Concentration Risk | Total Lease Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of lease revenue | 2.60% | 2.40% | 1.20%
Other Countries |  |  |
Segment Reporting Information [Line Items] |  |  |
Lease revenue | $ 3,375,960 | $ 3,544,979 | $ 3,737,485
Other Countries | Geographic Concentration Risk | Total Lease Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of lease revenue | 71.50% | 72.80% | 74.80%

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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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