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Share Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) |  | 41,570 |
Total unrecognized compensation cost |  | $ 5.9 |
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 1 month 6 days |
Restricted Stock | Employees and Non-employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  | 3 years |
Cash-settled Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  | 3 years |
Granted (in shares) |  | 28,925 |
Total unrecognized compensation cost |  | $ 4.6 |
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 1 month 6 days |
Performance Shares Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  |  | 3 years
Granted (in shares) |  | 52,375 | 62,755
Payout percent |  |  | 239.00%
Stock issued during period (in shares) | 143,897 |  |
Total unrecognized compensation cost |  | $ 10.0 |
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year |
Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation cost |  | $ 15.3 |
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 4 months 24 days |

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