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Stock-Based Compensation Expense and Related Tax Benefit (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options | $ 526 | $ 443 | $ 993 | $ 1,024
Restricted stock units | 6,367 | 5,977 | 14,176 | 12,444
Unrestricted stock awards | 206 | 158 | 412 | 315
Total stock-based compensation | 8,159 | 7,103 | 17,074 | 15,226
Related tax benefit | 1,420 | 1,275 | 3,187 | 2,718
Phantom Share Units (PSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Phantom stock units | $ 1,060 | $ 525 | $ 1,493 | $ 1,443

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