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Fair Value Measurements (Fair Value Of Flight Equipment As Of The Measurement Date, The Valuation Technique And The Related Unobservable Inputs) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair value | $ 2,425,173 | $ 2,957,707
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair value | 2,364,627 | 2,822,545
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair value | 60,546 | $ 135,162
Flight Equipment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair value | $ 492,600 |
Minimum [Member] | Flight Equipment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value inputs, discount rate | 0.00% |
Fair value unobservable input remaining holding period | 0 years |
Fair value unobservable input present value of non contractual cash flows | 0.00% |
Maximum [Member] | Flight Equipment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value inputs, discount rate | 14.00% |
Fair value unobservable input remaining holding period | 14 years |
Fair value unobservable input present value of non contractual cash flows | 100.00% |
Weighted Average [Member] | Flight Equipment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value inputs, discount rate | 5.00% |
Fair value unobservable input remaining holding period | 7 years |
Fair value unobservable input present value of non contractual cash flows | 25.00% |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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