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Stock-Based Compensation Expense and Related Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options $ 340 $ 467
Restricted stock units 5,931 7,809
Unrestricted stock awards 227 206
Total stock-based compensation 7,615 8,915
Related tax benefit 1,363 1,767
Phantom Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Phantom stock units $ 1,117 $ 433