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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Cash flows from operating activities:              
Net income (loss) $ 12,194 $ 3,974 $ 12,293 $ 16,635 $ 16,168 $ 28,928  
Adjustments to reconcile net income to net cash provided by operating activities:              
Provision for losses on accounts receivable         169 69  
Reversal of gain on sales to equity method investee         (11) (1)  
Depreciation and amortization         43,238 33,519  
Deferred income tax expense         6,312 1,840  
Income tax expense arising from restricted share vesting and stock options exercised         (581) (816)  
Stock-based compensation expense         1,712 3,332  
Income from equity method investment (4,094)   (5,381)   (7,770) (11,324)  
Loss (gain) on disposition of property and equipment         1,539 (11,778)  
Changes in operating assets and liabilities:              
Receivables and advances         (8,133) (13,225)  
Prepaid expenses and other assets         (7,105) (6,770)  
Inventory and supplies         (757) 406  
Insurance and claims accrual         7,702 (3,609)  
Accounts payable and accrued expenses         (8,382) (8,203)  
Net cash flows provided by operating activities         44,101 12,368  
Cash flows used by investing activities:              
Acquisition, net of cash acquired         (4,556) (99,887)  
Other investments         (299) (1,448)  
Purchase of property and equipment         (98,896) (59,067)  
Proceeds from disposition of property and equipment         17,280 47,073  
Net cash flows used by investing activities         (86,471) (113,329)  
Cash flows from financing activities:              
Change in checks outstanding in excess of bank balances         1,185 2,096  
Cash dividend         (2,891) (2,908)  
Proceeds from issuance of notes payable         89,411 44,673  
Repayments of notes payable         (28,053) (4,438)  
Repayments of finance lease obligations         (364) (3,508)  
Proceeds under revolving credit facility         52,178 94,542  
Repayments under revolving credit facility and draw note         (63,757) (54,385)  
Payment of contingent consideration liability         (7,023) (9,187)  
Proceeds from exercise of stock options         1,009 236  
Payment of minimum tax withholdings on stock compensation         (339) (1,520)  
Common stock repurchased         0 (25,488)  
Net cash flows provided by financing activities         41,356 40,113  
Net change in cash and cash equivalents         (1,014) (60,848)  
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 $ 1,280   $ 7,817   $ 1,280 $ 7,817 $ 2,294