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Common Stock Incentive Plan - Restricted Stock (Details) - Restricted Stock - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
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May 31, 2021 | Jun. 30, 2021
Common Stock Incentive Plan |  |
Shares granted in period (in shares) |  | 112,498
Vesting period (in years) |  | 4 years
Unamortized share-based compensation expense |  | $ 11.0
Independent directors |  |
Common Stock Incentive Plan |  |
Shares granted in period (in shares) | 36,000 |
Independent directors | Vest immediately |  |
Common Stock Incentive Plan |  |
Shares granted in period (in shares) | 24,000 |
Independent directors | Vest over service period |  |
Common Stock Incentive Plan |  |
Shares granted in period (in shares) | 12,000 |
Vesting period (in years) | 3 years |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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