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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Lease & related maintenance and rental revenues $ 1,024,985 $ 940,422
Contract with customer, revenue, remaining performance obligation 2,400,000  
Maintenance Services    
Disaggregation of Revenue [Line Items]    
Lease & related maintenance and rental revenues $ 257,000 $ 250,000