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Selected Balance Sheet Information: Changes to Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss, Current | $ 8,609 | $ 8,609 | $ 3,159 | $ 2,444 | $ 3,209
Additions Charged to Costs and Expenses |  | 8,471 | 5,637 |  |
Recoveries and Other Additions |  | 3,720 | 2,742 |  |
Write-offs and Other Deductions |  | (6,026) | $ (8,429) |  |
Adjustment Related to COVID-19 |  |  |  |  |
Additions Charged to Costs and Expenses | $ 1,700 | $ 3,700 |  |  |

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