SEGMENT INFORMATION - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
SEGMENT INFORMATION
Total segment gross profit	$ 75,606	$ 69,450	$ 253,878	$ 236,423
Costs and expenses
General and administrative expenses	9,927	7,554	30,020	25,797
Depreciation and amortization	117	122	346	371
Operating income	65,562	61,774	223,512	210,255
Fair value changes in equity securities	(462)	356	(171)	(1,221)
Interest and other income	2,436	3,571	7,348	5,665
Interest and other expense	(7,285)	(8,814)	(24,867)	(11,110)
Income before income taxes	$ 60,251	$ 56,887	$ 205,822	$ 203,589