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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Disaggregation of Revenue [Line Items]          
Lease & related maintenance and rental revenues $ 933,771 $ 959,189 $ 2,730,187 $ 2,792,581  
Deferred revenue 622,767   622,767   $ 603,687
Amount of revenue recognized, previously included in deferred revenue     142,000    
Increase in deferred revenue during the period     161,000    
Contracted not recognized revenue 2,700,000   2,700,000    
Capitalized sales commissions 91,000   91,000   105,000
Initial direct costs of leases     47,000   55,000
Amortization of capitalized sales commissions 11,000 11,000 33,000 32,000  
Maintenance Services          
Disaggregation of Revenue [Line Items]          
Lease & related maintenance and rental revenues 241,000 $ 235,000 719,000 $ 710,000  
ChoiceLease          
Disaggregation of Revenue [Line Items]          
Deferred revenue $ 623,000   $ 623,000   $ 604,000