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Receivables - Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance $ 1,339 $ 1,407
Additions Charged to Expense 3,138 986
Reductions for Amounts Written-Off, Net of Recoveries (1,262) (1,054)
Ending Balance $ 3,215 $ 1,339