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Accrued maintenance liability (Tables)
 6 Months Ended
Jun. 30, 2019
Accrued Maintenance Liability [Abstract]  
Schedule of movements in accrued maintenance liability
Movements in accrued maintenance liability during the six months ended June 30, 2019 and 2018 were as follows:
 
Six Months Ended June 30,
 
2019
 
2018
Accrued maintenance liability at beginning of period
$
2,237,494

 
$
2,461,799

Maintenance payments received
358,694

 
362,801

Maintenance payments returned
(206,456
)
 
(276,144
)
Release to income upon sale
(64,066
)
 
(169,678
)
Release to income other than upon sale
(87,061
)
 
(113,184
)
Lessor contribution, top ups and other
4,148

 
(12,803
)
Accrued maintenance liability at end of period
$
2,242,753

 
$
2,252,791