CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
REVENUES
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Customer Services [Member]	Customer Services [Member]
Customer services	$ 748,349	$ 658,015
COSTS AND EXPENSES
Cost of services provided (exclusive of depreciation and amortization below)	365,558	326,842
Sales, general and administrative	223,057	196,431
Depreciation and amortization	27,310	22,502
Total operating expenses	615,925	545,775
OPERATING INCOME	132,424	112,240
Interest expense, net	7,725	465
Other expense (income), net	61	(4,714)
CONSOLIDATED INCOME BEFORE INCOME TAXES	124,638	116,489
PROVISION FOR INCOME TAXES	30,244	28,255
NET INCOME	$ 94,394	$ 88,234
NET INCOME PER SHARE - BASIC (in USD per share)	$ 0.19	$ 0.18
NET INCOME PER SHARE - DILUTED (in USD per share)	$ 0.19	$ 0.18
Weighted average shares outstanding - basic (in shares)	484,131	492,516
Weighted average shares outstanding - diluted (in shares)	484,318	492,701
DIVIDENDS PAID PER SHARE (in USD per share)	$ 0.15	$ 0.13