FAIR VALUE MEASUREMENTS AND INVESTMENTS - Investments (Details) - USD ($) $ in Thousands	6 Months Ended
	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