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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Cash flows from operating activities:              
Net income (loss) $ 13,033 $ 3,974 $ 13,506 $ 16,635 $ 29,202 $ 42,434  
Adjustments to reconcile net income to net cash provided by operating activities:              
Provision for losses on accounts receivable         (46) 10  
Reversal of gain on sales to equity method investee         (28) (1)  
Depreciation and amortization         64,460 51,701  
Deferred income tax expense         5,426 4,128  
Income tax expense arising from restricted share vesting and stock options exercised         (658) (816)  
Stock-based compensation expense         2,700 5,216  
Income from equity method investment (3,993)   (5,335)   (11,763) (16,659)  
Return on investment from equity method investee         3,675 9,800  
Loss (gain) on disposition of property and equipment         1,748 (12,580)  
Changes in operating assets and liabilities:              
Receivables and advances         7,704 (24,563)  
Prepaid expenses and other assets         (4,080) (2,511)  
Inventory and supplies         (1,261) (332)  
Insurance and claims accrual         8,242 (1,645)  
Accounts payable and accrued expenses         (4,360) (1,209)  
Net cash flows provided by operating activities         100,961 52,973  
Cash flows used by investing activities:              
Acquisition, net of cash acquired         (4,556) (107,922)  
Other investments         (488) (1,580)  
Purchase of property and equipment         (131,494) (112,047)  
Proceeds from disposition of property and equipment         32,332 76,954  
Net cash flows used by investing activities         (104,206) (144,595)  
Cash flows from financing activities:              
Change in checks outstanding in excess of bank balances         0 771  
Cash dividend         (4,341) (4,344)  
Proceeds from issuance of notes payable         104,785 98,451  
Repayments of notes payable         (45,949) (23,142)  
Repayments of finance lease obligations         (553) (5,432)  
Proceeds under revolving credit facility         57,247 123,463  
Repayments under revolving credit facility and draw note         (68,826) (123,463)  
Payment of contingent consideration liability         (7,023) (9,187)  
Proceeds from exercise of stock options         1,147 236  
Payment of minimum tax withholdings on stock compensation         (339) (1,520)  
Common stock repurchased         0 (25,488)  
Net cash flows provided by financing activities         36,148 30,345  
Net change in cash and cash equivalents         32,903 (61,277)  
Cash and cash equivalents at beginning of period   $ 2,294   $ 68,665 2,294 68,665 $ 68,665
Cash and cash equivalents at end of period $ 35,197   $ 7,388   $ 35,197 $ 7,388 $ 2,294