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Common Stock Incentive Plan - Performance Shares and Restricted Stock Units (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) shares
Performance Shares and Restricted Stock Units |
Common Stock Incentive Plan |
Unamortized share-based compensation expense | $ | $ 13.8
Performance Shares |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 115,137
Vesting rights percentage | 50.00%
Vesting period (in years) | 3 years
Restricted Stock Units |
Common Stock Incentive Plan |
Shares granted in period (in shares) | 5,482
Vesting period (in years) | 4 years

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