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Equity Incentive Awards (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options, granted in period, gross (in shares) |  | 16,185 |  |  |  |
Options, granted in period (usd per share) |  | $ 68.74 |  |  |  |
General and Administrative Expense |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense | $ 2.8 |  |  | $ 2.9 | $ 8.2 | $ 8.5
2014 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) |  | 58,192 | 104,734 |  |  |
Restricted Stock | 2014 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares categorized as vesting |  |  | 50.00% |  |  |
Vesting period |  |  | 3 years |  |  |
Fair value of shares issued |  | $ 4.0 | $ 3.3 |  |  |
Shares categorized as performance based (percent) |  |  | 50.00% |  |  |
Restricted Stock | 2014 Plan | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 33.33% |  |  |
Restricted Stock | 2014 Plan | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 33.33% |  |  |
Restricted Stock | 2014 Plan | Share-based Payment Arrangement, Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 33.33% |  |  |
Performance Shares | 2014 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fair value of shares issued |  |  | $ 1.1 |  |  |
Grants in period (in shares) |  |  | 17,454 |  |  |

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