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Investments (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments [Abstract] |
Schedule of changes in equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
​ | ​ | (in thousands) | ​
Beginning balance | ​ | $ | 33,555 | ​ | $ | 45,693 | ​ | $ | 35,532 | ​ | $ | 46,503 | ​
Contributions | ​ | ​ | 513 | ​ | ​ | 665 | ​ | ​ | 1,391 | ​ | ​ | 1,290 | ​
Net loss on equity method investments | ​ | ​ | (1,536) | ​ | ​ | (152) | ​ | ​ | (3,542) | ​ | ​ | (705) | ​
Distributions received | ​ | ​ | (2,904) | ​ | ​ | (1,118) | ​ | ​ | (3,753) | ​ | ​ | (2,000) | ​
Ending balance | ​ | $ | 29,628 | ​ | $ | 45,088 | ​ | $ | 29,628 | ​ | $ | 45,088 | ​
Schedule of debt securities holdings |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025 | ​
​ | ​ | Cost Basis | ​ | Unrealized Gains (1) | ​ | Fair Value | ​
​ | ​ | (in thousands, except unit data) | ​
Debt Securities | ​ | $ | 2,127 | ​ | $ | 10,919 | ​ | $ | 13,046 | ​
(1) | Unrealized gains in our debt securities are included in the Change in unrealized gains (losses) on debt securities line item within our condensed consolidated statements of comprehensive income.

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