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Stock-Based Compensation Expense and Related Tax Benefit (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options | $ 278 | $ 371 | $ 562 | $ 711
Restricted stock units | 5,869 | 5,511 | 11,453 | 11,442
Unrestricted stock awards | 258 | 206 | 517 | 433
Total stock-based compensation | 6,987 | 7,313 | 13,304 | 14,928
Related tax benefit | 1,434 | 1,318 | 2,803 | 2,681
Phantom Share Units (PSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Phantom stock units | $ 582 | $ 1,225 | $ 772 | $ 2,342

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