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Stock-based Compensation (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020
Stock-based compensation (benefit) expense |  | $ 900,000 | $ 1,200,000 |  | $ 4,300,000 | $ 6,500,000 |
Income tax benefits related to the stock-based compensation plans |  | $ 200,000 |  | $ 200,000 | $ 1,000,000.0 | $ 1,500,000 |
Stock options outstanding |  | 0 |  |  | 0 |  | 0
Omnibus Plan 2014 [Member] |  |  |  |  |  |  |
Awards vesting period | 3 years |  |  |  |  |  |
The 2019 Long-term Incentive Compensation Program [Member] |  |  |  |  |  |  |
PRSU Awards, Percentage of Target Award, Below Threshold-level Performance | 0.00% |  |  |  |  |  |
PRSU Awards, Percentage of Target Award, Threshold-level Performance | 50.00% |  |  |  |  |  |
PRSU Awards, Percentage of Target Award, Target-Level Performance | 100.00% |  |  |  |  |  |
PRSU Awards, Percentage of Target Award, Maximum-Level Performance | 150.00% |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Awards granted |  |  |  |  | 172,728 | 263,574 | 0
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member] |  |  |  |  |  |  |
Total unrecognized compensation cost |  | $ 6,300,000 |  |  | $ 6,300,000 |  | $ 6,300,000
Weighted-average period of recognition of compensation cost |  |  |  |  | 2 years 6 months |  |
Total fair value of awards vested |  | $ 200,000 | $ 700,000 |  | $ 5,200,000 | $ 6,900,000 |
Performance-based Restricted Stock Units [Member] |  |  |  |  |  |  |
Awards granted |  | 0 | 8,260 |  | 72,143 | 66,130 |
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member] |  |  |  |  |  |  |
Stock-based compensation (benefit) expense |  | $ 100,000 | $ 200,000 |  | $ 1,200,000 | $ 100,000 |
Total fair value of awards vested |  | $ 3,000 | $ 1,000 |  | $ 10,000 | $ 23,000 |

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- Definition Represents the number of performance-based restricted stock units that may be earned, expressed as a percentage of the target award, for maximum-level performance. + References No definition available. + Details
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