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EQUITY-BASED COMPENSATION - Share-repurchases (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
EQUITY-BASED COMPENSATION
Increase in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units	$ 1,208,000	$ 285,000	$ 9,424,000	$ 6,652,000
Class A common stock | 2016 plan
EQUITY-BASED COMPENSATION
Number of shares repurchased with employee minimum tax withholding requirements	67,422	32,143	668,672	576,430
Increase in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units	$ 1,200,000		$ 9,400,000
Decrease in Class A common stock	$ 1,000		$ 7,000

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