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Asset impairment (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) aircraft engine | Dec. 31, 2016 USD ($) aircraft | Dec. 31, 2015 USD ($) aircraft engine
Asset Impairment [Line Items] |  |  |
Asset impairment charges | $ | $ 61,286 | $ 81,607 | $ 16,335
Number of aircraft impaired | aircraft | 13 | 35 | 8
Number of engines impaired | engine | 2 |  | 12
Lease Termination Or Amendment [Member] |  |  |
Asset Impairment [Line Items] |  |  |
Number of aircraft impaired | aircraft | 6 | 25 | 4
Number of engines impaired | engine | 1 |  |
Part Of Sale Transactions And Classified As Flight Equipment Held For Sale [Member] |  |  |
Asset Impairment [Line Items] |  |  |
Number of aircraft impaired | aircraft | 7 | 10 |
Number of engines impaired | engine | 1 |  |
Undiscounted Cash Flows Substantially Do Not Exceed Carrying Value [Member] |  |  |
Asset Impairment [Line Items] |  |  |
Number of aircraft impaired | aircraft |  |  | 4
Number of engines impaired | engine |  |  | 12

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- Definition Asset impairment [Line Items] + References No definition available. + Details
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- Definition Number Of Aircraft Impaired + References No definition available. + Details
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- Definition Number of engines impaired + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Details
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