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Maintenance rights intangible and lease premium, net (Estimated future amortization expense for lease premium) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
2018 | $ 24,870 |
2019 | 21,176 |
2020 | 21,176 |
2021 | 21,176 |
2022 | 21,176 |
Thereafter | 177,238 |
Finite-lived intangible assets | 286,812 | $ 317,988
Lease Premiums [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2018 | 11,219 |
2019 | 10,466 |
2020 | 7,727 |
2021 | 5,394 |
2022 | 914 |
Thereafter | 1,539 |
Finite-lived intangible assets | $ 37,259 | $ 50,891

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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