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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for credit losses applied to accounts receivable in the balance sheet - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period $ 2,210 $ 1,452 $ 1,794
Charged to Costs and Expenses 3,525 2,567 1,677
Deductions(1) 2,365 1,809 2,019
Balance at End of Period $ 3,370 $ 2,210 $ 1,452