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Stockholders' Equity (Deficit) - New Hire Equity Awards, Inducement Awards, Incentive Compensation and Other Awards (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
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Sep. 26, 2018 shares | Sep. 18, 2017 $ / shares shares | Jan. 15, 2016 award $ / shares shares | Mar. 31, 2018 shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target level for the determination of performance goals and measures |  |  |  |  | 100.00% |  |
Additional awards of restricted stock | award |  |  | 2 |  |  |  |
Performance achievement, percentage |  |  |  |  |  |  | 200.00%
Vested (in share) |  |  |  |  | 151,280 | 607,231 | 179,826
Expense related to the SLO program | $ |  |  |  |  | $ 29.2 | $ 44.9 | $ 59.9
Share based compensation expense recognized period |  |  |  |  | 15 months |  |
Forfeited (in shares) |  |  |  |  | 86,518 | 184,235 | 89,699
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued as part of acquisition | 20,000 |  |  |  | 20,000 | 0 | 0
2017 Performance-vesting New Hire Award |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Fair value on grant date (in usd per share) | $ / shares |  | $ 10.63 |  |  |  |  |
Time Vesting Inducement Award |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of units granted (in shares) |  |  | 75,000 |  |  |  |
Fair value on grant date (in usd per share) | $ / shares |  |  | $ 39.95 |  |  |  |
2014 Special PSU Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
PSU awards performance period |  |  |  |  | 3 years |  |
Percentage of reduction in amount earned based on free cash flow performance |  |  |  |  | 25.00% |  |
PSUs earned paid out period |  |  |  |  | 2 years |  |
Vested (in share) |  |  |  | 658,783 |  |  |
SLO Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of units granted (in shares) |  |  |  |  | 109,841 | 136,783 | 20,587
Increments of cash bonus, percent |  |  |  |  | 25.00% |  |
Restricted stock shares and restricted stock units included in SLO Award target |  |  |  |  | 47,736 |  |
Expense related to the SLO program | $ |  |  |  |  | $ 1.6 | $ 1.1 | $ 2.5
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 | $ |  |  |  |  | $ 0.3 |  |
Forfeited (in shares) |  |  |  |  | 5,177 |  |
2017 Annual Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of units granted (in shares) |  |  |  |  | 23,478 |  |
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 usd per share) | $ / shares |  | $ 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 usd per share) | $ / shares |  | $ 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 usd per share) | $ / shares |  | $ 75.00 |  |  |  |  |

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