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SIGNIFICANT ACCOUNTING POLICIES - Allowance for CA losses ("ALCAL") (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]        
Percentage of loss rate to the allowance for CA losses     1.50%  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
ALCAL balance, beginning $ 1,587 $ 900 $ 900 $ 153
Provision for ALCAL 1,595 2,566 (5,723) (2,701)
Recoveries for ALCAL (1,268) (2,100) (4,247) (1,854)
CA receivables charged off (321) (286) (789) (100)
ALCAL balance, ending $ 1,593 $ 1,080 $ 1,587 $ 900
Minimum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Percentage of loss rate to the allowance for CA losses 0.75% 1.50% 0.75%  
Maximum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Percentage of loss rate to the allowance for CA losses 3.81% 4.19% 5.10%