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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

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