CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income	$ 6,248	$ 35,534
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	74,270	74,313
Deferred income taxes	2,828	(111)
Gain on disposal of property and equipment	(3,568)	(18,339)
Non-cash equity compensation	2,250	3,403
Insurance and claims accruals, net of current portion	(4,015)	954
Loss on investments in equity securities	138	81
Loss from equity method investment	133	0
Other	(3,141)	(417)
Changes in certain working capital items:
Accounts receivable, net	27,481	57,866
Other current assets	7,139	17,336
Accounts payable	(5,274)	6,484
Other current liabilities	(15,904)	(10,257)
Net cash provided by operating activities	88,585	166,847
Cash flows from investing activities:
Additions to property and equipment	(58,235)	(161,764)
Proceeds from sales of property and equipment	39,200	59,021
Net cash invested in acquisition	0	(188)
Investment in equity securities	(11)	0
Payment to acquire equity method investment	(1,060)	(2,125)
Purchase of promissory note	0	(25,000)
Decrease in notes receivable	696	826
Net cash used in investing activities	(19,410)	(129,230)
Cash flows from financing activities:
Repayments of short-term debt	(21,250)	(2,500)
Proceeds from issuance of short-term debt	20,000	0
Repayments of long-term debt	(50,000)	0
Dividends on common stock	(8,882)	(8,220)
Repurchases of common stock	(6,550)	0
Tax withholding related to net share settlements of restricted stock awards	(4,087)	(5,514)
Net cash used in financing activities	(70,769)	(16,234)
Effect of exchange rate fluctuations on cash	208	968
Net increase (decrease) in cash and cash equivalents	(1,386)	22,351
Cash and cash equivalents, beginning of period	61,723	107,240
Cash and cash equivalents, end of period	60,337	129,591
Supplemental disclosures of cash flow information:
Interest paid	9,328	8,244
Income taxes paid	1,165	219
Supplemental schedule of non-cash investing and financing activities:
Notes receivable issued upon sale of property and equipment	402	756
Change in fair value of interest rate swaps	116	(973)
Property and equipment acquired included in accounts payable	19,765	4,008
Property and equipment disposed included in other receivables	0	110
Dividends accrued but not yet paid at end of period	8,878	8,239
Contingent consideration associated with acquisitions	$ 0	$ (800)