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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Leases and related maintenance and rental revenues $ 3,994,481 $ 3,704,045 $ 3,784,744
Contracted not recognized revenue 2,400,000    
Initial direct costs of leases 106,000 89,000  
Sales commissions expense 44,000 44,000 43,000
Start-up Costs      
Disaggregation of Revenue [Line Items]      
Capitalized start-up costs 54,000 28,000  
Start-up contract amortization expense 23,000 11,000 11,000
Maintenance Services      
Disaggregation of Revenue [Line Items]      
Leases and related maintenance and rental revenues $ 1,000,000 $ 965,000 $ 950,000