Annual report pursuant to Section 13 and 15(d)

AIRCRAFT AND ENGINES HELD FOR LEASE AND LEASE RENTAL - Components (Details)

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AIRCRAFT AND ENGINES HELD FOR LEASE AND LEASE RENTAL - Components (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment of leased assets $ 3,035,578 $ 0  
Depreciation expense 19,976,000 27,064,000 $ 27,609,000
Contingent rental fees $ 11,851,000 21,550,000 29,186,000
Lease term (in years) 3 years    
Aircraft and Engines      
Aircraft and engines held for operating leases $ 228,942,000 246,883,000  
Accumulated depreciation (142,098,000) (134,987,000)  
Property held for operating leases, net $ 86,844,000 $ 111,896,000  
Discontinued operations      
Aircraft and Engines      
Accumulated depreciation     $ (1,659,000)