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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  | 5,120 |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) | 838,698 | 838,698 | 424,341 | 838,698 | 424,341 | 507,536 | 422,928
Forfeited (in shares) |  |  |  | 0 |  |  |
Performance Share Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) | 2,018,518 | 2,018,518 | 653,365 | 2,018,518 | 653,365 | 842,792 | 0
2010 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) | 81,837 | 81,837 |  | 81,837 |  |  |
Share-based compensation expense |  | $ 0.6 | $ 0.3 |  | $ 0.6 | $ 1.1 |
Forfeited (in shares) |  | 0 | 5,120 | 0 | 5,120 |  |
Unrecognized compensation cost | $ 4.2 | $ 4.2 | $ 2.1 | $ 4.2 | $ 2.1 |  |
Unrecognized compensation cost, period for recognition |  |  |  | 2 years 3 months 18 days |  |  |
Fair value of vested shares |  |  |  | $ 1.3 | 1.1 |  |
Requisite service period |  |  |  | 3 years |  |  |
Award vesting period |  |  |  | 3 years |  |  |
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  |
2017 Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Increase the shares reserved | 7,600,000 |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) | 13,170,000 | 13,170,000 |  | 13,170,000 |  |  |
Shares available for grant (in shares) | 9,051,591 | 9,051,591 |  | 9,051,591 |  | 3,865,174 |
2017 Incentive Plan | Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares Issued |  |  |  | 228,750 |  | 131,975 |
2017 Incentive Plan | Employee |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares Issued |  |  |  | 828,701 |  |  |
2017 Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) | 756,861 | 756,861 |  | 756,861 |  | 290,373 |
Shares available for grant (in shares) |  |  |  |  |  | 1,280,392 |
2017 Incentive Plan | Performance Share Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for grant (in shares) | 3,060,958 | 3,060,958 |  | 3,060,958 |  |  |
Share-based compensation expense |  | $ 0.7 | 0.2 | $ 1.4 | 0.2 |  |
Unrecognized compensation cost | $ 5.9 | $ 5.9 | $ 2.4 | $ 5.9 | $ 2.4 |  |
Award vesting period |  |  |  | 3 years |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR performance Is Less Than The Thirtieth Percentile |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 0.00% |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR Performance Is Equal To The Fiftieth Percentile |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 100.00% |  |  |
2017 Incentive Plan | Performance Share Awards | Board of Directors Chairman |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Fair value, expected term |  |  |  | 3 years |  |  |
Fair value, expected term for volatility rate |  |  |  | 3 years |  |  |
2017 Incentive Plan | Employee Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 292,459 |

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