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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
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity-based compensation expense $ 1,885 $ 1,617
Deferred compensation stock equivalent units expense 19 16
Total tax benefit recognized for equity-based expense 83 72
Performance stock awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity-based compensation expense 1,158 1,044
Restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity-based compensation expense $ 708 $ 557