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Stock-based Payments and Director Fees - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Management fees | $ 2,300,000 |  | $ 4,600,000 |
Related party expense – management fee | $ 2,270,000 | $ 2,143,000 | $ 4,543,000 | $ 3,942,000
Restricted stock | Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Percentage of shares vesting |  |  | 33.33% |
2014 Director Equity Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of annual retainer received in shares |  |  | 40.00% |
2014 Director Equity Plan | Restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Annual retainer amount |  |  | $ 100,000 |
Long term incentive plan | Restricted stock | Initial public offering |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of restricted stock awards issued to independent directors (in shares) |  |  | 2,000 |
Thetis Asset Management LLC |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Related party expense – management fee |  | $ 2,100,000 |  | $ 3,900,000

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