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Equity Awards and Instruments - Summary of Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense $ 23,617 $ 6,046    
Stock Option        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense 5,849 4,795 $ 6,342 $ 4,808
Restricted stock expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense 2,104 1,251 $ 1,749 $ 3,074
Stock grants expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense 219 0    
Restricted Stock and Restricted Stock Units (RSUs)        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense $ 15,445 $ 0