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Goodwill and Other Intangible Assets - Amortization expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
2020   $ 17,422  
2021   11,963  
2022   8,543  
2023   3,798  
2024   2,058  
Thereafter   2,529  
Net Book Value $ 46,560 $ 46,313 $ 53,772