Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 19,351	$ 12,511
Marketable securities	11,590	10,772
Accounts receivable - net of allowance for credit losses of $7,806 and $11,229, respectively	293,646	287,946
Contract assets	29,752	729
Other receivables	30,174	22,633
Prepaid expenses and other	$ 23,962	$ 30,171
Other Receivable, after Allowance for Credit Loss, Current, Related Party [Extensible Enumeration]	Affiliates [Member]	Affiliates [Member]
Total current assets	$ 409,813	$ 365,472
Property and equipment, net	742,366	561,089
Operating lease right-of-use asset	74,003	87,208
Goodwill	206,756	170,730
Intangible assets - net of accumulated amortization of $155,290 and $134,514, respectively	150,926	61,296
Contract assets, net of current portion	198,059	0
Deferred income taxes	329	1,225
Other assets	4,585	6,503
Total assets	1,786,837	1,253,523
Current liabilities:
Accounts payable	59,977	64,102
Current portion of long-term debt	88,812	70,689
Current portion of operating lease liabilities	28,563	29,998
Accrued expenses and other current liabilities	70,744	43,062
Insurance and claims	32,837	25,464
Due to affiliates	$ 23,300	$ 20,700
Other Liability, Current, Related Party [Extensible Enumeration]	Affiliates [Member]	Affiliates [Member]
Income taxes payable	$ 377	$ 6,364
Total current liabilities	304,568	260,416
Long-term liabilities:
Long-term debt, net of current portion	670,273	311,235
Operating lease liability, net of current portion	50,788	63,620
Deferred income taxes	109,012	79,567
Other long-term liabilities	5,173	6,487
Total long-term liabilities	835,246	460,909
Shareholders' equity:
Common stock, no par value. Authorized 100,000,000 shares; 26,319,754 and 31,007,100 shares issued; 26,317,326 and 26,284,223 shares outstanding, respectively	26,320	31,008
Paid-in capital	5,016	5,103
Treasury stock, at cost; 2,428 and 4,722,877 shares	(107)	(96,840)
Retained earnings	623,018	595,450
Accumulated other comprehensive income (loss):
Interest rate swaps, net of income taxes of $412 and $457, respectively	1,177	1,350
Foreign currency translation adjustments	(8,401)	(3,873)
Total shareholders’ equity	647,023	532,198
Total liabilities and shareholders’ equity	1,786,837	1,253,523
Affiliates [Member]
Current assets:
Due from affiliates	1,338	710
Current liabilities:
Due to affiliates	$ 23,258	$ 20,737