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Retirement Plans - Schedule of DCP Related Compensation (Income) Expense (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
DCP related compensation (income) expense |  |  | $ 3,994 | $ 4,323
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
DCP related compensation (income) expense | $ (115) | $ 304 | $ 408 | $ (75)

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- Details
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