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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 (loss) $ 35,921 $ 55,229 $ 108,682
Adjustments to reconcile net income to net cash provided by operating activities:      
(Reversal of) provision for losses on accounts receivable (23) (258) 367
Reversal of gain on sales to equity method investee, net (40) (16) (39)
Depreciation and amortization 86,529 69,943 57,512
Deferred income tax benefit 4,483 18,701 13,968
Income tax expense arising from restricted share vesting and stock options exercised (1,190) (2,226) (526)
Stock-based compensation expense 3,691 7,100 6,587
Income from equity method investment (14,713) (21,384) (25,193)
Return on investment in affiliated company 3,675 9,800 14,700
Gain (loss) on disposition of property and equipment 1,630 (12,585) (40,322)
Changes in operating assets and liabilities:      
Receivables and advances 2,749 (22,416) 39,465
Prepaid expenses and other assets (3,006) (3,997) (3,832)
Inventory and supplies (800) (317) (193)
Insurance and claims accrual 8,401 (3,542) (5,729)
Accounts payable and accrued expenses (4,414) (9,191) (6,217)
Net cash flows provided by operating activities 122,893 84,841 159,230
Cash flows from investing activities:      
Acquisitions, net of cash acquired (4,556) (107,934) (38,501)
Other investments (597) (2,204) (241)
Acquisition of property and equipment (152,962) (217,607) (100,468)
Proceeds from disposition of property and equipment 50,440 91,824 53,002
Net cash flows used by investing activities (107,675) (235,921) (86,208)
Cash flows from financing activities:      
Change in checks outstanding in excess of bank balances 0 0 (216)
Cash dividend (5,796) (5,781) (4,287)
Proceeds from issuance of notes payable 119,391 154,093 95,151
Proceeds from exercise of stock options 1,756 236 384
Repayments of notes payable (74,822) (30,390) (11,956)
Repayments of finance lease obligations (2,949) (5,619) (5,516)
Proceeds under revolving credit facility 57,421 139,837 60,226
Repayments under revolving credit facility (69,000) (128,258) (60,226)
Payment of minimum tax withholdings on stock compensation (871) (4,792) (1,606)
Payment of contingent liability (7,023) (9,187) 0
Common stock repurchased 0 (25,430) (84,723)
Net cash flows provided by (used in) financing activities 18,107 84,709 (12,769)
Net change in cash and cash equivalents 33,325 (66,371) 60,253
Cash and cash equivalents at beginning of year 2,294 68,665 8,412
Cash and cash equivalents at end of year 35,619 2,294 68,665
Supplemental disclosure of cash flow information:      
Interest, net of capitalized interest 5,674 5,319 3,306
Income taxes 7,268 4,186 16,653
Non-cash transactions during the year for:      
Equipment acquired under finance leases 815 5,938 458
Equipment acquired under operating leases 13,753 3,992 48,515
Contingent consideration associated with acquisitions 0 11,802 16,210
Non-cash debt reduction 26,240 0 0
Other contingent liabilities $ (800) $ (800) $ (1,000)