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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 1,831 $ 1,667 $ 3,449 $ 4,889
Deferred compensation stock equivalent units expense 15 53 31 181
Accelerated share-based termination benefits in connection with the merger   86   1,764
Total tax benefit recognized for equity-based expense 83 73 155 184
Performance stock awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense 1,187 1,074 2,231 2,010
Restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 629 $ 454 $ 1,187 $ 934