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Accrued maintenance liability (Tables) | 12 Months Ended
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Dec. 31, 2017
Accrued Maintenance Liability [Abstract] |
Schedule of movements in accrued maintenance liability | Movements in accrued maintenance liability during the years ended December 31, 2017 and 2016 were as follows:
| Year Ended December 31,
| 2017 |  | 2016
Accrued maintenance liability at beginning of period | $ | 2,750,576 |  |  | $ | 3,185,794 |
Maintenance payments received | 756,314 |  |  | 794,711 |
Maintenance payments returned | (523,403 | ) |  | (505,407 | )
Release to income upon sale | (275,360 | ) |  | (341,161 | )
Release to income other than upon sale | (302,408 | ) |  | (421,332 | )
Lessor contribution, top ups and other | 42,379 |  |  | 8,315 |
Interest accretion | 13,701 |  |  | 26,563 |
Additions due to aircraft acquisitions | — |  |  | 3,093 |
Accrued maintenance liability at end of period | $ | 2,461,799 |  |  | $ | 2,750,576 |

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- Definition Schedule Of Movements In Accrued Maintenance Liability [Table Text Block] + References No definition available. + Details
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