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Fair Value Measurements (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) item
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset impairment charges | $ | $ 81,607 | $ 16,335 | $ 21,828
Number of aircraft impaired | 35 | 8 | 8
Lease revenue | $ | $ 4,867,623 | $ 4,991,551 | $ 3,449,571
Number of engines impaired |  | 12 | 3
Flight Equipment [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Estimated useful life of asset, years | 25 years |  |
Lease Termination Or Amendment [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of aircraft impaired | 25 | 4 |
Lease revenue | $ | $ 95,900 | $ 20,500 |
Part Of Sale Transactions And Classified As Flight Equipment Held For Sale [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of aircraft impaired | 10 |  |

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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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- 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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