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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows provided by operating activities:    
Net income $ 31,852 $ 28,736
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 51,399 46,005
Tires in service amortization 3,328 3,346
Gain on disposition of revenue equipment (3,771) (2,778)
Deferred income taxes 1,263 2,601
Share-based payment arrangement compensation expense 972 1,002
Equity in loss from affiliate 0 68
Changes in other current operating items:    
Receivables 14,764 (2,798)
Prepaid expenses and other (3,798) (1,767)
Accounts payable 951 87
Insurance and claims accruals 4,105 2,804
Accrued and other current liabilities 3,002 (2,205)
Net cash provided by operating activities 104,067 75,101
Cash flows used for investing activities:    
Other (39) (25)
Net cash used for investing activities (59,190) (45,770)
Cash flows used for financing activities:    
Dividends on common stock (4,398) (3,276)
Repurchase and retirement of common stock (597) 0
Issuance of common stock from share-based payment arrangement exercises 4,417 758
Employee taxes paid in exchange for shares withheld (437) (784)
Net cash used for financing activities (1,015) (3,302)
Net change in cash and cash equivalents 43,862 26,029
Cash and cash equivalents:    
Beginning of period 31,461 56,763
End of period 75,323 82,792
Supplemental non-cash disclosure:    
Change in property and equipment not yet paid (5,985) 11,418
Operating lease assets and liabilities acquired 88 1,217
Supplemental disclosure of cash flow information:    
Income taxes 987 4,143
Interest 0 23
Revenue Equipment [Member]    
Cash flows used for investing activities:    
Revenue equipment additions (75,463) (60,784)
Proceeds from equipment dispositions 19,788 17,287
Buildings And Land Office Equipment And Other [Member]    
Cash flows used for investing activities:    
Revenue equipment additions $ (3,476) $ (2,248)