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Asset impairment (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Impairment Charges [Abstract]  
Schedule of asset impairment
Asset impairment consisted of the following for the years ended December 31, 2018, 2017 and 2016:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Flight equipment held for operating leases (Note 5)
$
39,318

 
$
54,331

 
$
78,335

Flight equipment held for sale
4,868

 
6,955

 
3,272

 
$
44,186

 
$
61,286

 
$
81,607