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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Investments (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Roll forward of investments |  |
Beginning balance | $ 38,169 | $ 48,444
Income (loss) recognized | 2,501 | (1,440)
Contributions / (distributions) | 695 | 1,231
Foreign currency gain (loss) | 229 | (1,423)
Gain recognized |  | 4,770
Ending balance | 41,594 | 51,582
Investments without a readily determinable fair value |  |
Roll forward of investments |  |
Beginning balance | 22,590 | 17,820
Income (loss) recognized | 1,786 |
Contributions / (distributions) | 425 |
Gain recognized |  | 4,770
Ending balance | 24,801 | 22,590
Fair value investments |  |
Roll forward of investments |  |
Beginning balance | 1,616 | 1,925
Income (loss) recognized | 130 | 205
Contributions / (distributions) | (360) | (169)
Ending balance | 1,386 | 1,961
Equity investments |  |
Roll forward of investments |  |
Beginning balance | 13,963 | 28,699
Income (loss) recognized | 585 | (1,645)
Contributions / (distributions) | 630 | 1,400
Foreign currency gain (loss) | 229 | (1,423)
Ending balance | $ 15,407 | $ 27,031

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