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Equity - Restricted Stock (Details) - Restricted stock and performance-based stock units - USD ($) | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Restricted stock awards |  |
Number of shares granted | 167,375 | 147,608
Compensation expense related to share-based award | $ 5,231,000 | $ 4,938,000
Nonvested awards |  |
Remaining compensation expense | 10,078,000 |
2020 |  |
Nonvested awards |  |
Remaining compensation expense | 1,781,000 |
2021 |  |
Nonvested awards |  |
Remaining compensation expense | 5,201,000 |
2022 |  |
Nonvested awards |  |
Remaining compensation expense | 2,729,000 |
2023 |  |
Nonvested awards |  |
Remaining compensation expense | $ 367,000 |
Grant Date Price $48.95 | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted | 76,464 |
Granted (in dollars per share) | $ 48.95 |
Vesting period | 3 years |
Grant Date Price $49.98 | TSR Targets |  |
Restricted stock awards |  |
Number of shares granted | 66,027 |
Granted (in dollars per share) | $ 49.98 |
Vesting period | 4 years |
Grant Date Price $49.98 | Accelerated TSR Targets |  |
Restricted stock awards |  |
Vesting period | 3 years |
Grant Date Price $38.45 | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted | 15,000 |
Granted (in dollars per share) | $ 38.45 |
Vesting period | 3 years |
Grant Date Price $38.45 | Vesting Date, May 27, 2021 |  |
Restricted stock awards |  |
Number of shares granted | 9,884 |
Granted (in dollars per share) | $ 38.45 |
Grant Date Price $46.54 | Three year vesting |  |
Restricted stock awards |  |
Number of shares granted |  | 78,276
Granted (in dollars per share) |  | $ 46.54
Vesting period |  | 3 years
Grant Date Price $46.54 | TSR Targets |  |
Restricted stock awards |  |
Number of shares granted |  | 60,836
Granted (in dollars per share) |  | $ 46.54
Vesting period |  | 4 years
Grant Date Price $46.54 | Accelerated TSR Targets |  |
Restricted stock awards |  |
Vesting period |  | 3 years
Grant Date Price $44.73 | Vesting Date, May 29, 2020 |  |
Restricted stock awards |  |
Number of shares granted |  | 8,496
Granted (in dollars per share) |  | $ 44.73

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