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Stock-Based Compensation Expense and Related Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options $ 344 $ 452 $ 1,055 $ 1,445
Restricted stock units 5,104 4,399 16,546 18,575
Unrestricted stock awards 217 206 650 618
Total stock-based compensation 6,184 5,639 21,112 22,713
Related tax benefit 1,159 1,070 3,840 4,257
Phantom Share Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Phantom stock units $ 519 $ 582 $ 2,861 $ 2,075