CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net income	$ 178,863	$ 154,704
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	38,702	35,153
Amortization of operating lease right-of-use assets	21,716	19,832
Amortization of intangibles	33,722	33,728
Amortization of deferred financing costs and debt discount	1,415	1,436
Provision for credit losses	4,380	2,754
Write-off of debt issuance costs	928	0
Gain on sale of property and equipment	(1,518)	(1,048)
Noncash stock compensation	10,637	10,290
Other, net	(8,824)	1,509
Changes in assets and liabilities, excluding effects of acquisitions
Accounts receivable	(28,695)	(98,528)
Inventories	18,715	(23,071)
Proceeds from termination of interest rate swap agreements	0	25,462
Other assets	10,701	4,773
Accounts payable	(8,269)	20,290
Income taxes receivable/payable	(198)	12,354
Other liabilities	(21,736)	(971)
Net cash provided by operating activities	250,539	198,667
Cash flows from investing activities
Purchases of investments	0	(344,388)
Maturities of short term investments	0	320,000
Purchases of property and equipment	(46,902)	(35,212)
Acquisitions of businesses, net of cash acquired of $10 and $330 in 2023 and 2022, respectively	(44,845)	(75,779)
Proceeds from sale of property and equipment	2,054	1,418
Settlements with interest rate swap counterparties	12,165	1,287
Other	(350)	(7,261)
Net cash used in investing activities	(77,878)	(139,935)
Cash flows from financing activities
Payments on Term Loan	(3,731)	(3,750)
Proceeds from vehicle and equipment notes payable	28,359	20,492
Debt issuance costs	(438)	(655)
Principal payments on long-term debt	(22,193)	(23,340)
Principal payments on finance lease obligations	(2,199)	(1,661)
Dividends paid	(53,779)	(53,821)
Acquisition-related obligations	(2,721)	(9,423)
Repurchase of common stock	0	(112,193)
Surrender of common stock awards by employees	(5,827)	(4,464)
Net cash used in financing activities	(62,529)	(188,815)
Net change in cash and cash equivalents	110,132	(130,083)
Cash and cash equivalents at beginning of period	229,627	333,485
Cash and cash equivalents at end of period	339,759	203,402
Supplemental disclosures of cash flow information
Interest	36,332	40,639
Income taxes, net of refunds	64,177	43,512
Supplemental disclosure of noncash activities
Right-of-use assets obtained in exchange for operating lease obligations	23,188	22,056
Release of indemnification of acquisition-related debt	0	980
Property and equipment obtained in exchange for finance lease obligations	2,905	4,411
Seller obligations in connection with acquisition of businesses	8,290	25,534
Unpaid purchases of property and equipment included in accounts payable	$ 1,943	$ 857