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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
401(k) Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employer matching contribution (as a percent) |  |  |  | 50.00% |  |
Employer matching contribution percent of employees' salary (up to) |  |  |  | 5.00% |  |
2005 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for issuance (in shares) |  | 7,000,000.0 |  | 7,000,000.0 |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation |  | $ 1.1 | $ 1.2 | $ 3.2 | $ 4.9 |
Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation |  | 1.0 | 1.2 | $ 3.0 | 3.9 |
Share-based payment awards vested (in shares) | 589,335 |  |  |  |  |
Award vesting percentage | 200.00% |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Performance Share Units | Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment awards vested (in shares) | 1,178,670 |  |  |  |  |
Fair value of awards vested | $ 11.4 |  |  |  |  |
Fixed Value Cash Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Long-term incentive cash awards granted |  | 4.7 |  | $ 4.7 |  | $ 4.6
Vesting period |  |  |  | 3 years |  |
Compensation expense |  | $ 1.1 | $ 0.8 | $ 3.4 | $ 2.4 |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for issuance (in shares) |  | 1,800,000 |  | 1,800,000 |  |
Purchase limit per employee (in shares) |  |  |  | 260 |  |

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