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Basis Of Presentation And New Accounting Standards - New Accounting Standards (Details) - USD ($) $ in Thousands |  | 9 Months Ended
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Jan. 01, 2020 | Sep. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Provision for expected credit losses on accounts receivable |  | $ 2,387
Retained Earnings | Accounting Standards Update 2016-13 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Provision for expected credit losses on accounts receivable | $ 600 |
Tax effect of expected credit losses | $ 200 |

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