Consolidated Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net income	$ 33,325	$ 64,796	$ 72,140
Adjustments to reconcile net income to net cash provided by operating activities net of assets/liabilities acquired:
Depreciation	73,368	64,562	53,571
Amortization	5,084	5,432	5,072
Gain on sale of assets	(4,669)	(5,710)	(7,169)
Deferred income taxes	8,611	2,682	1,175
Other	4,688	9,502	2,790
Changes in operating assets and liabilities, net of assets acquired:
Accounts receivable	12,475	(36,591)	(38,086)
Accounts payable and accrued expenses	965	12,431	7,720
Increase (Decrease) in Prepaid Expense	(1,320)	4,826	(12,257)
Self-insurance accruals	30,901	10,173	284
Mitigation bank credit inventory	(3,138)	(930)	(17,664)
Other, net	(5,716)	13,373	3,874
Adjustments to reconcile net income to net cash provided by operating activities	121,249	79,750	(690)
Net cash provided by operating activities	154,574	144,546	71,450
Capital expenditures:
Equipment	(81,406)	(93,949)	(65,286)
Land and buildings	(37,622)	(49,233)	(22,036)
Purchases of businesses, net of cash acquired and debt incurred	(7,352)	(18,587)	(21,497)
Proceeds from sales of property and equipment	8,402	8,995	12,231
Purchases of marketable securities	(57,617)	(41,152)	(47,199)
Proceeds from sale of marketable securities	50,329	24,283	43,912
Net cash used in investing activities	(125,266)	(169,643)	(99,875)
Financing activities
Revolving credit facility borrowings	775,970	745,264	788,165
Revolving credit facility payments	864,433	673,934	796,982
Proceeds from notes payable	208,334	121,527	164,107
Payments of notes payable	(99,328)	(117,885)	(93,327)
Payments of finance leases	(8,361)	(6,572)	(3,973)
Purchases of common shares for treasury	(97,750)	(76,136)	(78,076)
Sales of common shares from treasury	52,339	39,879	41,172
Cash received on common-share subscriptions	2,955	3,829	3,682
Dividends	(4,314)	(4,185)	(3,850)
Net cash (used in) provided by financing activities	(34,588)	31,787	20,918
Effect of exchange rate changes on cash	206	(289)	51
(Decrease) increase in cash	(5,074)	6,401	(7,456)
Cash, beginning of year		17,471	11,070	$ 18,526
Cash, end of year	$ 12,397	$ 17,471	$ 11,070