Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash Flows from Operating Activities
Net income	$ 188,487	$ 211,680
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,511	47,218
Stock option expense	24,374	23,933
Benefit for deferred income taxes	(16,259)	(2,245)
Noncash long-term incentive compensation	3,057	15,783
Litigation settlements	1,850	(5,750)
Noncash directors' compensation	1,123	1,282
Amortization of debt issuance costs	241	241
Changes in operating assets and liabilities:
Increase in accounts receivable	(44,403)	(14,336)
(Increase)/decrease in inventories	(45)	2,125
Increase in prepaid expenses	(8,603)	(1,173)
Increase/(decrease) in accounts payable and other current liabilities	10,102	(19,641)
Change in current income taxes	(2,162)	(4,545)
Net change in lease assets and liabilities	(576)	(400)
Decrease/(increase) in other assets	42,048	(21,101)
Increase in other liabilities	6,355	18,348
Other sources	639	1,165
Net cash provided by operating activities	254,739	252,584
Cash Flows from Investing Activities
Capital expenditures	(46,447)	(36,770)
Proceeds from sale of fixed assets	3,751	3,060
Business combinations, net of cash acquired	(225)	(97,400)
Other uses	(468)	(281)
Net cash used by investing activities	(43,389)	(131,391)
Cash Flows from Financing Activities
Purchases of treasury stock	(256,944)	(152,049)
Proceeds from exercise of stock options	27,152	49,906
Dividends paid	(23,196)	(19,594)
Capital stock surrendered to pay taxes on stock-based compensation	(8,484)	(8,827)
Change in cash overdrafts payable	610	(15,749)
Other sources/(uses)	914	(387)
Net cash used by financing activities	(259,948)	(146,700)
Decrease in Cash and Cash Equivalents	(48,598)	(25,507)
Cash and cash equivalents at beginning of period	178,350	263,958
Cash and cash equivalents at end of period	$ 129,752	$ 238,451