CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 33,570	$ 112,290	$ 245,580
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	290,405	299,509	279,923
Deferred income taxes	(50,200)	8,153	42,553
Gain on disposal of property and equipment	(15,331)	(42,440)	(88,564)
Non-cash equity compensation	8,856	11,943	12,486
Insurance and claims accruals, net of current portion	(2,777)	(5,246)	7,726
Loss (gain) on investments in equity securities, net	(7,930)	278	(12,195)
Loss (earnings) from equity method investment	(556)	1,046	0
Other	(9,298)	(7,612)	(13,295)
Changes in certain working capital items:
Accounts receivable, net	53,260	73,921	3,174
Other current assets	16,703	10,266	(18,333)
Accounts payable	(10,391)	3,288	(3,665)
Other current liabilities	23,423	8,970	(6,679)
Net cash provided by operating activities	329,734	474,366	448,711
Cash flows from investing activities:
Additions to property and equipment	(413,799)	(598,785)	(507,252)
Proceeds from sales of property and equipment	178,912	190,087	189,673
Net cash invested in acquisitions	0	(188)	(184,118)
Investment in equity securities, net	(6,042)	(2,931)	(20,250)
Payments to acquire equity method investment	(3,820)	(3,385)	0
Purchase of promissory note	0	(25,000)	0
Decrease in notes receivable	3,301	5,258	7,614
Net cash used in investing activities	(241,448)	(434,944)	(514,333)
Cash flows from financing activities:
Repayments of short-term debt	(92,500)	(50,000)	(3,750)
Proceeds from issuance of short-term debt	110,000	45,000	0
Repayments of long-term debt	(221,250)	(90,000)	(100,000)
Proceeds from issuance of long-term debt	205,000	50,000	370,000
Dividends on common stock	(35,066)	(34,208)	(32,162)
Repurchases of common stock	(67,069)	0	(110,400)
Tax withholding related to net share settlements of restricted stock awards	(4,831)	(6,359)	(4,082)
Distribution to noncontrolling interest	0	0	(1,572)
Other	0	(1,500)	0
Net cash provided by (used in) financing activities	(105,716)	(87,067)	118,034
Effect of exchange rate fluctuations on cash	(3,541)	2,128	632
Net increase (decrease) in cash and cash equivalents	(20,971)	(45,517)	53,044
Cash and cash equivalents, beginning of period	61,723	107,240	54,196
Cash and cash equivalents, end of period	40,752	61,723	107,240
Supplemental disclosures of cash flow information:
Interest paid	40,156	27,212	11,186
Income taxes paid	25,831	17,892	40,313
Supplemental schedule of non-cash investing and financing activities:
Notes receivable issued upon sale of property and equipment	2,577	3,145	5,577
Change in fair value of interest rate swaps	(1,386)	(4,512)	6,886
Property and equipment acquired included in accounts payable	1,069	14,239	5,937
Property and equipment disposed included in other receivables	0	0	110
Dividends accrued but not yet paid at end of period	8,659	8,882	8,220
Contingent consideration associated with acquisition	$ 0	$ (800)	$ 13,400