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Stockholders' Deficit - New Hire Equity Awards, Inducement Awards, Incentive Compensation and Other Awards (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 26, 2018 | Sep. 18, 2017 | Feb. 28, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Target level for the determination of performance goals and measures |  |  |  | 100.00% |  |
Expense related to the SLO program |  |  |  | $ 32.9 | $ 29.2 | $ 44.9
Share based compensation expense recognized period |  |  |  |  | 15 years |
Forfeited (in shares) |  |  |  | 110,984 | 86,518 | 184,235
2017 Performance-vesting New Hire Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fair value on grant date (in dollars per share) |  | $ 10.63 |  |  |  |
2016- 2018 PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance units paid out percentage |  |  | 0.00% |  |  |
Performance units paid out (in units) |  |  | 0 |  |  |
SLO Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of units granted (in shares) |  |  |  | 6,321 | 109,841 | 136,783
Increments of cash bonus, percent |  |  |  | 25.00% |  |
Restricted stock shares and restricted stock units included in SLO Award target |  |  |  | 71,663 |  |
Expense related to the SLO program |  |  |  | $ 3.2 | $ 1.6 | $ 1.1
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted and issued under the Omnibus Incentive Plan and Directors Stock Plan to Directors (in shares) |  |  |  | 46,195 |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued as part of acquisition (in shares) | 20,000 |  |  | 0 | 20,000 | 0
Performance Share Unit Awards For Acquisitions |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of units granted (in shares) |  |  |  |  |  | 30,506
Expense related to the SLO program |  |  |  | $ (0.4) | $ 0.3 |
Forfeited (in shares) |  |  |  | 7,130 | 5,177 |
Chief Operating Officer and CEO-Designate | Time Vesting New Hire Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of units granted (in shares) |  | 30,000 |  |  |  |
Fair value on grant date (in dollars per share) |  | $ 42.89 |  |  |  |
Chief Operating Officer and CEO-Designate | 2017 Performance-vesting New Hire Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of units granted (in shares) |  | 70,000 |  |  |  |
Target level for the determination of performance goals and measures |  | 100.00% |  |  |  |
Chief Operating Officer and CEO-Designate | Tranche One | 2017 Performance-vesting New Hire Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cumulative stockholder return rate |  | 33.00% |  |  |  |
Chief Operating Officer and CEO-Designate | Minimum | Tranche One | 2017 Performance-vesting New Hire Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share price (in dollars per share) |  | $ 60.00 |  |  |  |
Chief Operating Officer and CEO-Designate | Minimum | Tranche Two | 2017 Performance-vesting New Hire Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share price (in dollars per share) |  | $ 75.00 |  |  |  |

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