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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows provided by operating activities:    
Net income $ 60,698 $ 49,896
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 76,598 76,979
Tires in service amortization 4,858 4,937
Deferred income taxes (409) 3,868
Share-based payment arrangement compensation expense 1,839 1,364
Changes in other current operating items:    
Receivables (14,805) 16,847
Prepaid expenses and other (3,076) (2,317)
Accounts payable 7,502 1,315
Insurance and claims accruals 1,533 4,900
Accrued and other current liabilities 5,030 4,535
Net cash provided by operating activities 127,909 154,707
Cash flows used for investing activities:    
Other (36) (39)
Net cash used for investing activities (102,142) (93,748)
Cash flows used for financing activities:    
Dividends paid on common stock (6,626) (7,705)
Repurchase and retirement of common stock 0 (597)
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards 558 4,598
Employee taxes paid in exchange for shares withheld (1,926) (437)
Net cash used for financing activities (7,994) (4,141)
Net change in cash and cash equivalents 17,773 56,818
Cash and cash equivalents:    
Beginning of period 66,127 31,461
End of period 83,900 88,279
Supplemental non-cash disclosure:    
Dividends declared and not yet paid 44,789 0
Change in property and equipment not yet paid 692 2,355
Operating lease assets and liabilities acquired 0 88
Supplemental disclosure of cash flow information:    
Income taxes 17,214 5,543
Interest 0 0
Revenue Equipment [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on disposition of asset (11,859) (5,899)
Cash flows used for investing activities:    
Property, plant and equipment additions (157,301) (138,457)
Proceeds from property, plant and equipment dispositions 58,525 46,872
Facility [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on disposition of asset 0 (1,718)
Buildings And Land Office Equipment And Other [Member]    
Cash flows used for investing activities:    
Property, plant and equipment additions (3,330) (4,697)
Proceeds from property, plant and equipment dispositions $ 0 $ 2,573