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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net (loss) income $ 60,731 $ (42,718)
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 1,338 3,134
Reversal of gain on sales to equity method investee, net 52 14
Depreciation and amortization 53,881 65,480
Impairment of property and equipment 0 26,569
Amortization of deferred financing fees 0 154
Deferred income tax (benefit) expense 18,413 (15,092)
Income tax (expense) benefit arising from restricted share vesting and stock options exercised (334) 167
Stock-based compensation expense 9,059 2,270
Equity in income of affiliate (14,782) (3,944)
Return on investment in affiliated company 4,900 1,470
Gain on disposition of property and equipment (3,799) (7,677)
(Gain) loss on disposition of reportable segment (3,412) 40,431
Return on investment in available-for-sale securities (63) (25)
Changes in operating assets and liabilities:    
Receivables and advances (36,544) (60,849)
Prepaid expenses and other assets (710) 531
Inventory and supplies (204) 1,091
Insurance and claims accrual (31,653) 32,203
Accounts payable and accrued expenses 16,345 19,831
Net cash flows provided by operating activities 73,218 63,040
Cash flows from investing activities:    
Investment in affiliated company (13) 0
Redemption of available-for-sale securities 1,508 1,442
Acquisition of property and equipment (35,285) (94,049)
Proceeds from disposition of reportable segment 0 108,375
Proceeds from disposition of property and equipment 44,134 122,278
Net cash flows provided by investing activities 10,344 138,046
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances (1,215) 839
Proceeds from issuance of notes payable 0 75,591
Repayments of notes payable (14,397) (289,834)
Repayments of finance lease obligations (5,626) (20,083)
Proceeds under revolving credit facility 644,874 1,341,678
Repayments under revolving credit facility (695,513) (1,326,678)
Payment of minimum tax withholdings on stock compensation (1,332) (297)
Common stock repurchased (10,348) (17,486)
Net cash flows used in financing activities (83,557) (236,270)
Net change in cash and cash equivalents 5 (35,184)
Cash and cash equivalents at beginning of year 8,407 43,591
Cash and cash equivalents at end of year 8,412 8,407
Supplemental disclosure of cash flow information:    
Interest, net of capitalized interest 2,762 7,365
Income taxes 10,236 870
Non-cash transactions during the year for:    
Equipment purchased under finance leases 0 3,258
Contingent liabilities $ 0 $ 44,151