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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Revenue Equipment [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on disposition of assets $ (4,137) $ (2,948)
Cash flows used for investing activities:    
Revenue equipment additions (66,009) (68,524)
Proceeds from revenue equipment dispositions 29,112 28,867
Buildings And Land Office Equipment And Other [Member]    
Cash flows used for investing activities:    
Revenue equipment additions (2,764) (8,280)
Proceeds from revenue equipment dispositions 7 4,625
Net income 16,724 18,545
Depreciation 40,415 36,138
Gain on disposition of assets (3,712)
Deferred income taxes 6,830 4,612
Tax (deficiencies) benefits from share-based payment arrangement exercises (148) 448
Excess tax benefits from share-based payment arrangement exercises (30) (428)
Share-based payment arrangement compensation expense 668 856
Equity in loss from affiliate 325 143
Receivables 12,256 11,536
Prepaid expenses and other 1,012 948
Accounts payable and accrued liabilities 5,041 5,991
Insurance and claims accruals 1,165 (353)
Net cash provided by operating activities 80,121 71,776
Other (24) (23)
Net cash used for investing activities (39,678) (43,335)
Cash flows used for financing activities:    
Borrowings under credit facility and long-term debt 76,044 13,444
Repayment of borrowings under credit facility and long-term debt (109,535) (37,817)
Repurchase and retirement of common stock (7,513)
Dividends on common stock (1,622) (1,678)
Issuance of common stock from share-based payment arrangement exercises 2,054 2,303
Excess tax benefits from share-based payment arrangement exercises 30 428
Employee taxes paid in exchange for shares withheld (127)
Change in checks issued in excess of cash balances (745)
Net cash used for financing activities (40,669) (24,065)
Net change in cash and cash equivalents (226) 4,376
Cash and cash equivalents:    
Beginning of period 434 123
End of period 208 4,499
Supplemental non-cash disclosure:    
Change in property and equipment not yet paid 6,532 30,210
Income taxes (3,631) (7,440)
Interest $ 127 $ 53