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Equity Awards and Instruments - Summary of Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense $ 20,405 $ 2,021 $ 23,617 $ 6,046
Stock option expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense 2,893 1,575 5,849 4,795
Restricted stock expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense 2,067 446 2,104 1,251
Stock grants expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total pre-tax expense 0 0 219 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 $ 15,445 $ 0