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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 2,063 $ 1,913 $ 5,928 $ 5,362
Deferred compensation stock equivalent units expense 19 22 57 53
Total tax benefit recognized for equity-based expense 97 79 273 234
Performance stock awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense 1,315 1,186 3,716 3,417
Restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 729 $ 705 $ 2,155 $ 1,892