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Income Taxes - Income before income taxes (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Components of income before income taxes        
Domestic     $ 61,691 $ 56,426
International     66,418 56,436
Income before income taxes $ 98,181 $ 78,604 $ 128,109 $ 112,862