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Common Stock Incentive Plan (Details) - 2012 Plan - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | May 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Common Stock Incentive Plan |  |  |  |  |  |
Plan term from the date of adoption |  |  |  |  | 10 years |
General and administrative expense |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Share-based compensation costs recognized |  |  | $ 3.9 | $ 3.4 | $ 12.5 | $ 10.6
Maximum |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Authorized shares |  |  | 3,985,734 |  | 3,985,734 |
Restricted Stock |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Shares granted |  |  |  |  | 147,000 |
Vesting period |  |  |  |  | 4 years |
Remaining unamortized share-based compensation expense |  |  | $ 16.7 |  | $ 16.7 |
Restricted Stock | Directors |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Shares granted | 8,000 | 28,000 |  |  |  |
Shares vested |  | 20,000 |  |  |  |
Vesting period | 3 years |  |  |  |  |
Restricted Stock | Directors | Three year vesting period |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Shares granted |  | 4,000 |  |  |  |
Vesting period |  | 3 years |  |  |  |
Restricted Stock | Directors | Two year vesting period |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Shares granted |  | 4,000 |  |  |  |
Vesting period |  | 2 years |  |  |  |
Performance Shares and Restricted Stock Units |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Remaining unamortized share-based compensation expense |  |  | $ 13.6 |  | $ 13.6 |
Performance Shares |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |
Performance Shares | Executive officers |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Shares granted |  |  |  |  | 190,449 |
Performance Shares | Executive officers | Three year vesting period |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Awards vesting on the first and second January 1 after the end of the three year performance period (as a percent) |  |  |  |  | 50.00% |
Restricted Stock Units |  |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |  |
Shares granted |  |  |  |  | 8,383 |
Vesting period |  |  |  |  | 4 years |

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