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Share Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  | 4 years |
Total unrecognized compensation cost |  | $ 17.3 |
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 6 months |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) |  | 40,890 |
Total unrecognized compensation cost |  | $ 2.0 |
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 2 months 12 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) |  | 25,585 |
Total unrecognized compensation cost |  | $ 5.4 |
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) |  | 56,860 | 69,995
Payout percent |  |  | 250.00%
Stock issued during period (in shares) | 174,994 |  |
Total unrecognized compensation cost |  | $ 12.6 |
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 1 month 6 days |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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