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Employee Benefit Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 15, 2019 | Jan. 31, 2021 | Jan. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of active incentive plans |  |  |  | 1 |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional shares authorized for issuance (in shares) | 1,500,000 |  |  |  |  |
Period common stock may be purchased through payroll deductions |  |  |  | 4 months |  |
Percentage of share of non-vested stock considered as call option |  |  |  | 85.00% |  |
Purchase limit per employee (in shares) |  |  |  | 260 |  |
Shares available for issuance (in shares) |  |  |  | 1,800,000 |  |
2005 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional shares authorized for issuance (in shares) | 7,000,000.0 |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Award vesting percentage |  |  |  | 33.00% |  |
Shares authorized for issuance (in shares) |  |  |  | 17,300,000 |  |
Shares available for issuance (in shares) |  |  |  | 6,800,000 |  |
2005 Incentive Plan | Maximum Shares as Incentive Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  | 2,000,000.0 |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 667,752 | 846,835 | 614,286
Granted (in dollars per share) |  |  |  | $ 7.06 | $ 6.02 | $ 7.46
Share-based compensation |  |  |  | $ 4.2 | $ 6.2 | $ 6.0
Future share-based compensation |  |  |  | $ 4.4 |  |
Weighted average vesting period (in years) |  |  |  | 1 year 2 months 12 days |  |
Share-based payment awards vested |  |  |  | 631,498 | 993,361 | 823,310
Fair value of awards vested |  |  |  | $ 5.4 | $ 6.5 | $ 6.4
RSUs | January 2021 RSU Grant | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  | 452,381 |  |  |  |
Granted (in dollars per share) |  | $ 4.20 |  |  |  |
Total market value of shares granted |  | $ 1.9 |  |  |  |
PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Award vesting percentage |  |  |  | 100.00% |  |
PSUs | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  |  | 200.00% |  |
PSUs | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  |  | 0.00% |  |
Equity PSU Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 200.00% |  |  |
Granted (in shares) |  |  |  | 369,938 | 688,540 | 449,271
Granted (in dollars per share) |  |  |  | $ 13.15 | $ 7.60 | $ 10.44
Share-based compensation |  |  |  | $ 4.0 | $ 5.1 | $ 3.8
Future share-based compensation |  |  |  | $ 4.6 |  |
Weighted average vesting period (in years) |  |  |  | 1 year |  |
Share-based payment awards vested |  |  | 589,335 | 589,335 | 0 | 0
Equity PSU Awards | Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment awards vested |  |  | 1,178,670 |  |  |
Fair value of awards vested |  |  | $ 11.4 |  |  |
Equity PSU Awards | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  | 200.00% |  |  |  |
Share-based payment awards vested |  | 368,038 |  |  |  |
Equity PSU Awards | Subsequent Event | Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment awards vested |  | 736,075 |  |  |  |
Fair value of awards vested |  | $ 3.1 |  |  |  |
Equity PSU Awards | January 2021 PSU Grant | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  | 452,381 |  |  |  |
Granted (in dollars per share) |  | $ 5.33 |  |  |  |
Total market value of shares granted |  | $ 2.4 |  |  |  |
Liability PSU Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation |  |  |  |  |  | $ 0.9
Cash paid to settle share-based award liability |  |  |  |  | $ 11.1 | 0.9
Fixed Value Cash Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Long-term incentive cash awards granted |  |  |  | $ 4.7 | 4.6 | 5.2
Compensation expense |  |  |  | $ 4.4 | 3.2 | $ 1.7
Fixed Value Cash Awards | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Long-term incentive cash awards granted |  | $ 3.4 |  |  |  |
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 participant' salary (up to) |  |  |  | 5.00% |  |
Plan cost recognized |  |  |  | $ 1.6 | $ 1.0 |

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