FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	$ 162,133	$ 143,499
Available-for-sale debt securities	39,212	39,459	$ 43,485
Deferred compensation plan liabilities	(162,133)	(143,499)
Bank debt	(381,000)	(312,400)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	162,133	143,499
Available-for-sale debt securities	39,212	39,459
Other depository assets	1,571	1,031
Deferred compensation plan liabilities	(162,133)	(143,499)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	4,890	3,999
Bank debt	(379,660)	(310,826)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent purchase price liabilities	$ (83,839)	$ (114,946)