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Investments in Other Companies (Tables) | 6 Months Ended
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Jun. 30, 2023
Investments in Other Companies |
Schedule of reconciliation of Level 3 investments | The table below shows the reconciliation of the Level 3 warrant and put option Eve Investments (in thousands): ​
​ | ​ | ​ | ​
Level 3 Investments: | ​ | ​
Balance at December 31, 2022 |  | $ | 14,180
Purchases | ​ |  | —
Unrealized gains | ​ |  | 4,591
Balance at June 30, 2023 | ​ | $ | 18,771

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