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Stock-Based Compensation Expense and Related Tax Benefit (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options | $ 452 | $ 389 | $ 1,445 | $ 1,413
Restricted stock units | 4,399 | 6,734 | 18,575 | 19,178
Unrestricted stock awards | 206 | 158 | 618 | 473
Total stock-based compensation | 5,639 | 8,103 | 22,713 | 23,329
Related tax benefit | 1,070 | 1,443 | 4,257 | 4,161
Phantom Share Units (PSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Phantom stock units | $ 582 | $ 822 | $ 2,075 | $ 2,265

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