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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows provided by operating activities:    
Net income $ 25,210 $ 25,161
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 63,875 61,205
Deferred income taxes 1,992 10,246
Tax deficiencies from share-based payment arrangement exercises (55)
Share-based payment arrangement compensation expense 916 741
Distribution from affiliate 400
Equity in loss from affiliate 271 621
Changes in other current operating items:    
Receivables (3,065) 8,251
Prepaid expenses and other 3,044 1,419
Accounts payable and accrued liabilities 1,192 2,617
Insurance and claims accruals 5,757 1,526
Net cash provided by operating activities 94,710 104,270
Cash flows used for investing activities:    
Other (34) (33)
Net cash used for investing activities (84,015) (68,842)
Cash flows used for financing activities:    
Borrowings under credit facility and long-term debt 30,816 130,128
Repayment of borrowings under credit facility and long-term debt (38,702) (159,446)
Repurchase and retirement of common stock (7,513)
Dividends on common stock (2,999) (2,436)
Issuance of common stock from share-based payment arrangement exercises 962 3,508
Employee taxes paid in exchange for shares withheld (47) (127)
Change in checks issued in excess of cash balances 199
Cash in lieu of fractional shares from stock split (54)
Net cash used for financing activities (10,024) (35,687)
Net change in cash and cash equivalents 671 (259)
Cash and cash equivalents:    
Beginning of period 488 434
End of period 1,159 175
Supplemental non-cash disclosure:    
Change in property and equipment not yet paid (3,244) 9,281
Income taxes 11,031 (2,595)
Interest 41 174
Revenue Equipment [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on disposition of assets (4,882) (7,462)
Cash flows used for investing activities:    
Revenue equipment additions (135,010) (111,503)
Proceeds from revenue equipment dispositions 53,586 48,097
Buildings And Land Office Equipment And Other [Member]    
Cash flows used for investing activities:    
Revenue equipment additions (2,557) (5,416)
Proceeds from revenue equipment dispositions $ 13