Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
OPERATING ACTIVITIES
Net income	$ 20,383	$ 93,681
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	96,806	47,620
Deferred income taxes	(13,440)	(12,709)
Stock-based compensation expense	393	343
Debt-related amortization	539	0
Gain on disposal of property and equipment	(14,809)	(85,970)
Changes in certain working capital items:
Trade receivables	25,348	(10,600)
Prepaid expenses and other current assets	6,193	(778)
Accounts payable, accrued liabilities, and accrued expenses	(19,086)	8,521
Accrued income taxes	(5,071)	18,400
Net cash provided by operating activities	97,256	58,508
INVESTING ACTIVITIES
Proceeds from sale of property and equipment	73,838	129,820
Purchases of property and equipment	(108,017)	(50,563)
Acquisition of business, net of cash acquired	0	(122,049)
Change in other assets	419	(9)
Net cash used in investing activities	(33,760)	(42,801)
FINANCING ACTIVITIES
Payments of cash dividends	(1,581)	(1,579)
Shares withheld for employee taxes related to stock-based compensation	(155)	(66)
Repayments of finance leases and debt	(64,773)	(1,113)
Net cash used in financing activities	(66,509)	(2,758)
Net increase (decrease) in cash, cash equivalents and restricted cash	(3,013)	12,949
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	64,478	173,767
End of period	61,465	186,716
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for interest expense	11,605	159
Cash paid during the period for income taxes, net of refunds	25,740	28,310
Noncash investing and financing activities:
Purchased property and equipment in accounts payable	18,683	1,033
Sold revenue equipment and property in other current assets	494	3,084
Common stock dividends declared in accounts payable	1,580	1,579
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0	4,653
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents	46,250	171,879
Restricted cash included in other current assets	741	897
Restricted cash included in other assets	14,474	13,940
Total cash, cash equivalents and restricted cash	$ 61,465	$ 186,716