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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 97,179 $ 42,999
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 21 1,045
(Reversal) deferral of gain on sales to equity method investee (30) 53
Depreciation and amortization 41,734 41,316
Deferred income tax expense 4,246 12,911
Income tax expense arising from restricted share vesting and stock options exercised (69) (216)
Stock-based compensation expense 5,142 6,803
Income from equity method investment (21,261) (9,572)
Return on investment in equity method investee 7,350 1,960
Gain on disposition of property and equipment (39,287) (3,683)
Gain on reversal of contingent loss of discontinued operations (700) (3,412)
Gain on investment in available-for-sale securities 0 (63)
Changes in operating assets and liabilities:    
Receivables and advances 31,104 (72,848)
Prepaid expenses and other assets 712 1,501
Inventory and supplies (399) (540)
Insurance and claims accrual (5,518) 25,153
Accounts payable and accrued expenses 845 24,831
Net cash flows provided by operating activities 121,069 68,238
Cash flows from investing activities:    
Acquisition of AAT Carriers, Inc., net of cash acquired (38,501) 0
Other investments (25) (13)
Purchase of available-for-sale securities 0 (33)
Purchase of property and equipment (61,408) (21,801)
Proceeds from disposition of property and equipment 50,112 43,812
Net cash flows (used) provided by investing activities (49,822) 21,965
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances (216) (1,215)
Cash dividend (3,192) 0
Proceeds from issuance of notes payable 65,253 0
Repayments of notes payable (5,964) (10,058)
Repayments of finance lease obligations (5,150) (3,193)
Proceeds under revolving credit facility 74,528 535,199
Repayments under revolving credit facility and draw note (74,528) (585,838)
Proceeds from exercise of stock options 143 0
Payment of minimum tax withholdings on stock compensation (390) (969)
Common stock repurchased (70,886) (10,348)
Net cash flows used by financing activities (20,402) (76,422)
Net change in cash and cash equivalents 50,845 13,781
Cash and cash equivalents at beginning of period 8,412 8,407
Cash and cash equivalents at end of period $ 59,257 $ 22,188