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Organization, Basis of Presentation, and Significant Accounting Policies - Income Taxes and Deferred Financing Costs (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |
Minimum distribution of adjusted taxable income for deducting dividends from federally taxable income (as a percent) | 90.00% |  |
Minimum distribution of REIT taxable income for federal income tax exemption (as a percent) | 100.00% |  |
Accounting Policies [Line Items] |  |  |
Income tax expense (benefit) | $ 14,646,000 | $ 5,733,000 | $ (3,247,000)
Unrecognized tax benefits | $ 0 | $ 0 |
Tax components of common stock dividends declared |  |  |
Capital gain tax rate (as a percent) | 20.00% | 20.00% | 20.00%
Ordinary income (as a percent) | 82.00% | 55.00% | 66.00%
20% capital gain (as a percent) | 15.00% | 26.00% | 24.00%
Unrecaptured 1250 gain (as a percent) | 3.00% | 19.00% | 10.00%
Total dividends (as a percent) | 100.00% | 100.00% | 100.00%
Unsecured notes |  |  |
Accounting Policies [Line Items] |  |  |
Accumulated amortization of deferred finance costs | $ 29,815,000 | $ 23,705,000 |
Secured notes |  |  |
Accounting Policies [Line Items] |  |  |
Accumulated amortization of deferred finance costs | 2,040,000 | 2,300,000 |
Variable rate unsecured credit facility |  |  |
Accounting Policies [Line Items] |  |  |
Accumulated amortization of deferred finance costs | $ 11,222,000 | $ 15,187,000 |

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