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Fair value measurements (Fair value of flight equipment measured on non-recurring basis) (Details) - Fair Value, Measurements, Nonrecurring [Member] - Flight Equipment [Member] - Level 3 - Income Approach Valuation Technique [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Flight equipment, fair value | $ 355,923
Minimum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Discount rate | 0.00%
Remaining holding period | 0 years
Non-contractual cash flows | 0.00%
Maximum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Discount rate | 10.00%
Remaining holding period | 13 years
Non-contractual cash flows | 100.00%
Weighted Average [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Discount rate | 5.00%
Remaining holding period | 8 years
Non-contractual cash flows | 38.00%

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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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