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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (10-K) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts, customers and other      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance $ 1,150 $ 1,163 $ 549
Additions (Charge to Expense) 1,483 1,840 1,725
Deductions (Write-offs, net of Recoveries) (1,882) (1,853) (1,111)
Ending Balance 751 1,150 1,163
Tax valuation allowances      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance 6,576 938 0
Additions (Charge to Expense) 11,680 5,638 938
Deductions (Write-offs, net of Recoveries) 0 0 0
Ending Balance $ 18,256 $ 6,576 $ 938