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Related Party Transactions and Investments in Non-Consolidated Entities (Tables) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Related Party Transactions and Investments in Non-Consolidated Entities |  |
Schedule of equity in losses of investments in non-consolidated REITs | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended | ​
​ | ​ | ​ | December 31, | ​
(in thousands) |  | 2021 |
​ | ​ | ​ | ​ |
Equity in income of East Wacker | ​ | $ | 421 | ​
Total | ​ | $ | 421 | ​
Schedule of distributions received from non-consolidated REITs | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended | ​
​ | ​ | ​ | December 31, | ​
(in thousands) |  | 2021 |
​ | ​ | ​ | ​ | ​
Distributions from East Wacker | ​ | $ | 421 | ​
​ | ​ | $ | 421 | ​
Allowance for credit losses rollforward | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
(In thousands) |  | ​ | 2023 |  | ​ | 2022 |  | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning allowance for credit losses | ​ | $ | (4,237) | ​ | $ | — | ​ | $ | —
Additional increases to the allowance for credit losses | ​ | ​ | — | ​ | ​ | (4,237) | ​ | ​ | —
Reductions to the allowance for credit losses | ​ | ​ | 4,237 | ​ | ​ | — | ​ | ​ | ​
Ending allowance for credit losses | ​ | $ | — | ​ | $ | (4,237) | ​ | $ | —
Quantitative information about significant unobservable inputs of Level 3 measurement |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value (1) at |  | ​ |  | Significant |  | Range | ​ | Weighted
Description | ​ | December 31, 2022 | ​ | Valuation Technique | ​ | Unobservable Input | ​ | Min | ​ | Max |  | Average (2)
​ | ​ | ​ | (in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Sponsored REIT Loan | ​ | $ | 19,763 |  | Discounted Cash Flows | ​ | Exit Cap Rate |  | 7.50 | % | ​ | 7.50 | % | ​ | 7.50 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | Discount Rate | ​ | 9.50 | % | ​ | 9.50 | % | ​ | 9.50 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Classified within Level 3 of the fair value hierarchy. | ​
(2) Unobservable inputs were weighted based on the fair value of the related instrument. | ​
​

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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