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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 28,928 $ 46,693
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 69 (26)
Reversal of gain on sales to equity method investee (1) (30)
Depreciation and amortization 33,519 27,377
Deferred income tax expense 1,840 620
Income tax expense arising from restricted share vesting and stock options exercised (816) (40)
Stock-based compensation expense 3,332 3,748
Income from equity method investment (11,324) (13,861)
Gain on disposition of property and equipment (11,778) (566)
Changes in operating assets and liabilities:    
Receivables and advances (13,225) 21,450
Prepaid expenses and other assets (6,770) 2,074
Inventory and supplies 406 (638)
Insurance and claims accrual (3,609) (6,332)
Accounts payable and accrued expenses (8,203) (3,566)
Net cash flows provided by operating activities 12,368 76,903
Cash flows from investing activities:    
Acquisition, net of cash acquired (99,887) (37,324)
Other investments (1,448) (12)
Purchase of property and equipment (59,067) (27,560)
Proceeds from disposition of property and equipment 47,073 1,931
Net cash flows used by investing activities (113,329) (62,965)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 2,096 (216)
Cash dividend (2,908) (2,022)
Proceeds from issuance of notes payable 44,673 35,917
Repayments of notes payable (4,438) (3,526)
Repayments of finance lease obligations (3,508) (4,295)
Proceeds under revolving credit facility 94,542 85,632
Repayments under revolving credit facility and draw note (54,385) (85,632)
Payment of contingent consideration liability (9,187) 0
Proceeds from exercise of stock options 236 0
Payment of minimum tax withholdings on stock compensation (1,520) (380)
Common stock repurchased (25,488) (43,365)
Net cash flows provided (used) by financing activities 40,113 (17,887)
Net change in cash and cash equivalents (60,848) (3,949)
Cash and cash equivalents at beginning of period 68,665 8,412
Cash and cash equivalents at end of period $ 7,817 $ 4,463