Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
OPERATING ACTIVITIES
Net income	$ 9,680	$ 118,095
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	147,919	82,408
Deferred income taxes	(11,903)	2,171
Stock-based compensation expense	928	504
Debt-related amortization	806	90
Gain on disposal of property and equipment	(15,873)	(92,806)
Changes in certain working capital items:
Trade receivables	25,874	(3,200)
Prepaid expenses and other current assets	4,604	(655)
Accounts payable, accrued liabilities, and accrued expenses	(25,176)	(1,725)
Accrued income taxes	(12,408)	7,668
Net cash provided by operating activities	124,451	112,550
INVESTING ACTIVITIES
Proceeds from sale of property and equipment	94,660	146,376
Purchases of property and equipment	(176,861)	(91,818)
Payments to Acquire Businesses, Net of Cash Acquired	0	(675,852)
Change in other assets	382	(159)
Net cash used in investing activities	(81,819)	(621,453)
FINANCING ACTIVITIES
Payments of cash dividends	(3,161)	(3,157)
Proceeds from Issuance of Long-term Debt	0	447,343
Shares withheld for employee taxes related to stock-based compensation	(213)	(75)
Repayments of finance leases and debt	(69,887)	(29,195)
Net cash provided by (used in) financing activities	(73,261)	414,916
Net decrease in cash, cash equivalents and restricted cash	(30,629)	(93,987)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	64,478	173,767
End of period	33,849	79,780
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for interest expense	16,779	989
Cash paid during the period for income taxes, net of refunds	29,138	32,695
Noncash investing and financing activities:
Fair value of revenue equipment traded	0	428
Purchased property and equipment in accounts payable	22,270	4,430
Sold revenue equipment and property in other current assets	2,089	3,058
Common stock dividends declared in accounts payable	1,581	1,580
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents	20,101	64,824
Restricted cash included in other current assets	299	880
Restricted cash included in other assets	13,449	14,076
Total cash, cash equivalents and restricted cash	$ 33,849	$ 79,780