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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 1,980 $ 1,831 $ 3,865 $ 3,449
Deferred compensation stock equivalent units expense 19 15 38 31
Total tax benefit recognized for equity-based expense 93 83 176 155
Performance stock awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense 1,243 1,187 2,401 2,231
Restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 718 $ 629 $ 1,426 $ 1,187