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Accrued maintenance liability
 12 Months Ended
Dec. 31, 2018
Accrued Maintenance Liability [Abstract]  
Accrued maintenance liability
Accrued maintenance liability
Movements in accrued maintenance liability during the years ended December 31, 2018 and 2017 were as follows:
 
Year Ended December 31,
 
2018
 
2017
Accrued maintenance liability at beginning of period
$
2,461,799

 
$
2,750,576

Maintenance payments received
743,256

 
756,314

Maintenance payments returned
(459,326
)
 
(523,403
)
Release to income upon sale
(261,240
)
 
(275,360
)
Release to income other than upon sale
(228,081
)
 
(302,408
)
Lessor contribution, top ups and other
(27,581
)
 
42,379

Interest accretion
8,667

 
13,701

Accrued maintenance liability at end of period
$
2,237,494

 
$
2,461,799