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Basis Of Presentation - Accounts and Other Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current |  | $ 82,369 | $ 89,747
Other Receivables |  | 2,466 | 2,199
Allowance for Doubtful Accounts, Premiums and Other Receivables |  | 2,746 | 2,829
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) | $ 200 |  |
Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, after Allowance for Credit Loss |  | 82,089 | 89,117
Receivables, Net, Current |  | $ 84,835 | $ 91,946

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