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Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Bank credit facility:      
Total carrying value of debt $ 589,583 $ 233,750 $ 258,750
Revolving Credit Facility | Line of Credit      
Bank credit facility:      
Total carrying value of debt   $ 233,750 $ 258,750