OPERATING SEGMENT DATA - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
OPERATING INCOME (LOSS)
Operating income	$ 42,116	$ 136,038	$ 63,275	$ 228,981
OTHER INCOME (COSTS)
Interest and dividend income	3,725	353	6,658	452
Interest and other related financing costs	(2,205)	(1,863)	(4,532)	(3,803)
Other, net	5,038	(2,807)	6,818	(3,633)
TOTAL OTHER INCOME (COSTS)	6,558	(4,317)	8,944	(6,984)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	48,674	131,721	72,219	221,997
Increase in fair value of equity investment	3,700		3,739
Operating Segments | Asset Based
OPERATING INCOME (LOSS)
Operating income	43,325	116,656	90,796	196,690
Operating Segments | Asset-Light
OPERATING INCOME (LOSS)
Operating income	13,180	27,479	(911)	48,595
Other and eliminations
OPERATING INCOME (LOSS)
Operating income	$ (14,389)	$ (8,097)	$ (26,610)	$ (16,304)