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Basis Of Presentation - Accounts and Other Receivables (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, after Allowance for Credit Loss | $ 87,648 | $ 86,327
Accounts Receivable, before Allowance for Credit Loss, Current | 88,280 | 85,274
Other Receivables | 2,174 | 3,850
Allowance for Doubtful Accounts, Premiums and Other Receivables | $ 2,806 | $ 2,797

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