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Stock-based Compensation (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 18, 2021 | Jan. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-based compensation (benefit) expense |  |  | $ 1,200,000 | $ 900,000 | $ 6,300,000 | $ 4,300,000
Income tax benefits related to the stock-based compensation plans |  |  | $ 300,000 | 200,000 | $ 1,700,000 | $ 1,000,000.0
Omnibus Plan 2014 [Member] |  |  |  |  |  |
Number of shares authorized |  |  | 1,171,343 |  | 1,171,343 |
Number of additional shares authorized | 1,100,000 |  |  |  |  |
The 2019 Long-term Incentive Compensation Program [Member] |  |  |  |  |  |
Awards vesting period |  | 3 years |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Awards granted |  |  |  |  | 238,985 | 172,728
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member] |  |  |  |  |  |
Total unrecognized compensation cost |  |  | $ 5,300,000 |  | $ 5,300,000 |
Weighted-average period of recognition of compensation cost |  |  |  |  | 2 years 4 months 24 days |
Total fair value of awards vested |  |  | 400,000 | 200,000 | $ 5,400,000 | $ 5,200,000
Performance-based Restricted Stock Units [Member] |  |  |  |  |  |
Awards granted |  |  |  |  | 62,790 | 72,143
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member] |  |  |  |  |  |
Stock-based compensation (benefit) expense |  |  | 200,000 | (100,000) | $ 800,000 | $ (1,200,000)
Total fair value of awards vested |  |  | $ 24,000 | $ 3,000 | $ 50,000 | $ 10,000

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