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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 42,434 $ 97,179
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 10 21
Reversal of gain on sales to equity method investee (1) (30)
Depreciation and amortization 51,701 41,734
Deferred income tax expense 4,128 4,246
Income tax expense arising from restricted share vesting and stock options exercised (816) (69)
Stock-based compensation expense 5,216 5,142
Income from equity method investment (16,659) (21,261)
Return on investment from equity method investee 9,800 7,350
Gain on disposition of property and equipment (12,580) (39,287)
Gain on reversal of contingent loss of discontinued operations 0 (700)
Changes in operating assets and liabilities:    
Receivables and advances (24,563) 31,104
Prepaid expenses and other assets (2,511) 712
Inventory and supplies (332) (399)
Insurance and claims accrual (1,645) (5,518)
Accounts payable and accrued expenses (1,209) 845
Net cash flows provided by operating activities 52,973 121,069
Cash flows from investing activities:    
Acquisition, net of cash acquired (107,922) (38,501)
Other investments (1,580) (25)
Purchase of property and equipment (112,047) (61,408)
Proceeds from disposition of property and equipment 76,954 50,112
Net cash flows used by investing activities (144,595) (49,822)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 771 (216)
Cash dividend (4,344) (3,192)
Proceeds from issuance of notes payable 98,451 65,253
Repayments of notes payable (23,142) (5,964)
Repayments of finance lease obligations (5,432) (5,150)
Proceeds under revolving credit facility 123,463 74,528
Repayments under revolving credit facility and draw note (123,463) (74,528)
Payment of contingent consideration liability (9,187) 0
Proceeds from exercise of stock options 236 143
Payment of minimum tax withholdings on stock compensation (1,520) (390)
Common stock repurchased (25,488) (70,886)
Net cash flows provided (used) by financing activities 30,345 (20,402)
Net change in cash and cash equivalents (61,277) 50,845
Cash and cash equivalents at beginning of period 68,665 8,412
Cash and cash equivalents at end of period $ 7,388 $ 59,257