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Equity-Based Compensation (Details of Equity-Based Compensation Expense and Related Income Tax Benefit) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 2,275 $ 2,063 $ 6,345 $ 5,928
Deferred compensation stock equivalent units expense 54 19 136 57
Total tax benefit recognized for equity-based expense 125 97 321 273
Performance stock awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense 1,416 1,315 4,012 3,716
Restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 805 $ 729 $ 2,197 $ 2,155