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Consolidated condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows provided by operating activities:    
Net income $ 84,840 $ 60,698
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 81,389 76,598
Tires in service amortization 4,861 4,858
Deferred income taxes 5,431 (409)
Share-based payment arrangement compensation expense 2,228 1,839
Changes in other current operating items:    
Receivables (24,657) (14,805)
Prepaid expenses and other (3,901) (3,076)
Accounts payable 14,364 7,502
Insurance and claims accruals 3,650 1,533
Accrued and other current liabilities 5,438 5,030
Net cash provided by operating activities 163,221 127,909
Cash flows used for investing activities:    
Other (38) (36)
Net cash used for investing activities (92,416) (102,142)
Cash flows used for financing activities:    
Repurchase and retirement of common stock (41,753) 0
Dividends paid on common stock (14,709) (6,626)
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards 1,764 558
Employee taxes paid in exchange for shares withheld (1,610) (1,926)
Net cash used for financing activities (56,308) (7,994)
Net change in cash and cash equivalents 14,497 17,773
Cash and cash equivalents:    
Beginning of period 56,995 66,127
End of period 71,492 83,900
Supplemental non-cash disclosure:    
Dividends declared and not yet paid 0 44,789
Change in property and equipment not yet paid 10,132 692
Supplemental disclosure of cash flow information:    
Income taxes 16,413 17,214
Interest 52 0
Revenue Equipment [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on disposition of revenue equipment (10,422) (11,859)
Cash flows used for investing activities:    
Revenue equipment additions (110,535) (157,301)
Proceeds from revenue equipment dispositions 28,527 58,525
Buildings And Land Office Equipment And Other [Member]    
Cash flows used for investing activities:    
Revenue equipment additions $ (10,370) $ (3,330)