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Retirement Plans - Deferred Compensation Plan (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits        
Bonus plan compensation expense     $ 3,994 $ 4,323
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits        
Deferred Compensation Arrangement with Individual, Postretirement Benefits        
Bonus plan compensation expense $ (115) $ 304 $ 408 $ (75)