SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CONSOLIDATED STATEMENTS OF INCOME (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
COSTS AND EXPENSES.
Sales, general and administrative	$ 802,710	$ 727,489	$ 657,209
Depreciation and amortization	91,326	86,558	79,331
Total operating expenses	2,202,435	1,976,664	1,785,132
OPERATING INCOME	493,388	447,636	376,088
CONSOLIDATED INCOME BEFORE INCOME TAXES	498,917	482,485	362,716
Provision for income taxes	130,318	125,920	95,960
NET INCOME	$ 368,599	$ 356,565	$ 266,756
NET INCOME PER SHARE - BASIC	$ 0.75	$ 0.72	$ 0.54
NET INCOME PER SHARE - DILUTED	$ 0.75	$ 0.72	$ 0.54
As reported
COSTS AND EXPENSES.
Sales, general and administrative		$ 727,489	$ 656,207
Depreciation and amortization		94,205	88,329
Total operating expenses		1,984,311	1,793,128
OPERATING INCOME		439,989	368,092
CONSOLIDATED INCOME BEFORE INCOME TAXES		474,838	354,720
Provision for income taxes		124,151	93,896
NET INCOME		$ 350,687	$ 260,824
NET INCOME PER SHARE - BASIC		$ 0.71	$ 0.53
NET INCOME PER SHARE - DILUTED		$ 0.71	$ 0.53
Adjustment
COSTS AND EXPENSES.
Sales, general and administrative			$ 1,002
Depreciation and amortization		$ (7,647)	(8,998)
Total operating expenses		(7,647)	(7,996)
OPERATING INCOME		7,647	7,996
CONSOLIDATED INCOME BEFORE INCOME TAXES		7,647	7,996
Provision for income taxes		1,769	2,064
NET INCOME		$ 5,878	$ 5,932
NET INCOME PER SHARE - BASIC		$ 0.01	$ 0.01
NET INCOME PER SHARE - DILUTED		$ 0.01	$ 0.01