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Employee Benefit Plans - Narrative (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 USD ($) $ / shares shares | Feb. 29, 2016 shares | Dec. 31, 2018 USD ($) long-term_incentive_stock-based_plan $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of stock plans | long-term_incentive_stock-based_plan |  |  | 1 |  |
Granted (in shares) | shares |  |  | 614,286 | 829,143 | 1,298,121
Granted (in dollars per share) | $ / shares |  |  | $ 7.46 | $ 8.39 | $ 5.70
Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long-term incentive cash awards granted | $ 4.4 |  |  |  |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized for issuance (in shares) | shares |  |  | 1,500,000 |  |
Shares available for issuance (in shares) | shares |  |  | 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) | shares |  | 130 |  |  |
2005 Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized for issuance (in shares) | shares |  |  | 10,300,000 |  |
Shares available for issuance (in shares) | shares |  |  | 1,700,000 |  |
Vesting period |  |  | 3 years |  |
Award vesting percentage |  |  | 33.00% |  |
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) | shares |  |  | 2,000,000 |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  | $ 6.0 | $ 7.9 | $ 5.8
Future share-based compensation |  |  | $ 5.0 |  |
Weighted average vesting period |  |  | 1 year |  |
Restricted Stock | January 2019 Restricted Stock Grant | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) | shares | 688,540 |  |  |  |
Granted (in dollars per share) | $ / shares | $ 5.41 |  |  |  |
Total market value of shares granted | $ 3.7 |  |  |  |
Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Award vesting percentage |  |  | 100.00% |  |
Granted (in shares) | shares |  |  | 449,271 | 671,771 | 1,161,672
Granted (in dollars per share) | $ / shares |  |  | $ 10.44 | $ 12.64 | $ 7.13
Share-based compensation |  |  | $ 4.7 | $ 7.4 | $ 6.8
Recorded liability |  |  | 11.1 | 11.1 |
Cash paid to settle share-based award liability |  |  | $ 0.9 | 0.6 | $ 0.2
Performance Share Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 200.00% |  |
Performance Share Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 0.00% |  |
Performance Share Units | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash paid to settle share-based award liability | $ 11.1 |  |  |  |
Performance Share Units | January 2019 PSU Grant | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) | shares | 688,540 |  |  |  |
Granted (in dollars per share) | $ / shares | $ 7.6 |  |  |  |
Modified Liability PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense in excess of fair value recorded in equity |  |  |  | $ 0.2 |
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 |  |  | $ 5.2 |  |
Compensation expense |  |  | $ 1.7 |  |

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