Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OPERATING ACTIVITIES
Net income	$ (29,722)	$ 14,775	$ 133,584
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	181,523	199,039	133,047
Deferred income taxes	(30,199)	(18,081)	2,412
Stock-based compensation expense	1,040	1,620	1,399
Debt-related amortization	1,053	1,069	360
Gain on disposal of property and equipment	(7,508)	(41,087)	(96,906)
Changes in certain working capital items (net of acquisition):
Trade receivables	11,120	37,079	20,033
Prepaid expenses and other current assets	3,762	9,065	845
Accounts payable, accrued liabilities, and accrued expenses	5,200	(30,998)	(1,227)
Accrued income taxes	8,079	(7,214)	1,166
Net cash provided by operating activities	144,348	165,267	194,713
INVESTING ACTIVITIES
Proceeds from sale of property and equipment	62,993	137,319	172,750
Purchases of property and equipment, net of trades	(109,536)	(208,596)	(160,568)
Acquisition of business, net of cash acquired	0	0	(675,852)
Change in other assets	4	3,410	411
Net cash used in investing activities	(46,539)	(67,867)	(663,259)
FINANCING ACTIVITIES
Cash dividends paid	(4,721)	(6,322)	(6,318)
Proceeds from issuance of long-term debt	0	0	447,343
Shares withheld for employee taxes related to stock-based compensation	(407)	(290)	(290)
Repayments on finance leases and debt	(100,304)	(114,078)	(81,478)
Repurchases of common stock	(7,281)	0	0
Net cash (used in) provided by financing activities	(112,713)	(120,690)	359,257
Net decrease in cash and cash equivalents	(14,904)	(23,290)	(109,289)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	41,188	64,478	173,767
End of period	26,284	41,188	64,478
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for interest expense	17,742	22,444	6,384
Cash paid during the period for income taxes, net of refunds	15,642	30,135	44,010
Noncash investing and financing activities:
Fair value of revenue equipment traded	0	0	428
Purchased property and equipment in accounts payable	3,307	3,912	11,938
Sold revenue equipment and property in other current assets	864	2,516	1,558
Common stock dividends declared in accounts payable	1,570	0	0
Right-of-use assets obtained in exchange for operating lease liabilities	0	8,236	3,345
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents	12,812	28,123	49,462
Restricted cash included in other current assets	280	332	752
Restricted cash included in other assets	13,192	12,733	14,264
Total cash, cash equivalents and restricted cash	$ 26,284	$ 41,188	$ 64,478