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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2023
INVESTMENT SECURITIES |
Schedule of marketable securities | ​ The Company’s available-for-sale securities as of September 30, 2023 and December 31, 2022 are summarized below (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Cost |  | Unrealized Gains in Investment Income |  | Unrealized Losses in Investment Income |  | Estimated Fair Value (Level 1 Inputs)
September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Stock | ​ | $ | 20,482 | ​ | $ | — | ​ | $ | (2,342) | ​ | $ | 18,140
Operating Units | ​ | ​ | 23,253 | ​ | ​ | — | ​ | ​ | (3,231) | ​ | ​ | 20,022
Total Equity Securities | ​ | ​ | 43,735 | ​ | ​ | — | ​ | ​ | (5,573) | ​ | ​ | 38,162
Total Available-for-Sale Securities | ​ | $ | 43,735 | ​ | $ | — | ​ | $ | (5,573) | ​ | $ | 38,162
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Stock | ​ | $ | 18,382 | ​ | $ | 308 | ​ | $ | — | ​ | $ | 18,690
Operating Units | ​ | ​ | 23,253 | ​ | ​ | 98 | ​ | ​ | — | ​ | ​ | 23,351
Total Equity Securities | ​ | ​ | 41,635 | ​ | ​ | 406 | ​ | ​ | — | ​ | ​ | 42,041
Total Available-for-Sale Securities | ​ | $ | 41,635 | ​ | $ | 406 | ​ | $ | — | ​ | $ | 42,041
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