OPERATING SEGMENT DATA - Revenue from Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
REVENUES
Revenues	$ 4,427,443	$ 5,029,008	$ 3,766,185
Asset Based
REVENUES
Revenues	2,749,803	2,896,284	2,470,529
Asset-Light
REVENUES
Revenues	1,673,399	2,128,394	1,291,679
Corporate and other
REVENUES
Revenues	4,241	4,330	3,977
Operating Segments | Asset Based
REVENUES
Revenues	2,871,004	3,010,900	2,573,773
Operating Segments | Asset-Light
REVENUES
Revenues	1,680,645	2,139,272	1,300,626
Intersegment revenues
REVENUES
Revenues	(128,447)	(125,494)	(112,191)
Intersegment revenues | Asset Based
REVENUES
Revenues	121,201	114,616	103,244
Intersegment revenues | Asset-Light
REVENUES
Revenues	7,246	10,878	8,947
Other and eliminations
REVENUES
Revenues	$ (124,206)	$ (121,164)	$ (108,214)