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Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operations:    
Net income $ 13,213 $ 14,869
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 33,236 31,907
Gain on disposition of revenue equipment (1,941) (3,652)
Deferred income taxes 2,151 3,130
Tax benefits from share-based payment arrangement exercises 134 143
Excess tax benefits from share-based payment arrangement exercises (90) (119)
Share-based payment arrangement compensation expense 611 651
Income before income taxes attributable to noncontrolling interest   84
Equity in earnings from affiliate (530) (44)
Changes in other current operating items:    
Receivables (7,205) (3,274)
Prepaid expenses and other 1,325 1,413
Accounts payable and accrued liabilities (817) 2,511
Insurance and claims accruals 608 191
Net cash provided by operating activities 40,695 47,810
CASH FLOWS USED FOR INVESTING ACTIVITIES:    
Decrease in cash and cash equivalents resulting from change to equity method of accounting   (1,924)
Other (18) (18)
Net cash used for investing activities (69,533) (54,416)
CASH FLOWS PROVIDED BY FINANCING ACTIVITIES:    
Borrowings under credit facility and long-term debt 26,875 36,946
Repayment of borrowings under credit facility and long-term debt (10,118) (32,285)
Dividends on common stock (1,669) (1,107)
Issuance of common stock from share-based payment arrangement exercises 966 179
Excess tax benefits from share-based payment arrangement exercises 90 119
Noncontrolling interest distributions   (84)
Net cash provided by financing activities 16,144 3,768
NET CHANGE IN CASH AND CASH EQUIVALENTS (12,694) (2,838)
CASH AND CASH EQUIVALENTS:    
Beginning of period 13,650 3,473
End of period 956 635
SUPPLEMENTAL NON-CASH DISCLOSURE:    
Change in property and equipment not yet paid for 4,837 9,560
Cash paid for:    
Interest 47 30
Income taxes 11,765 7,754
Revenue Equipment [Member]
    
CASH FLOWS USED FOR INVESTING ACTIVITIES:    
Proceeds from disposition of property, plant, and equipment 21,439 25,631
Buildings And Land, Office Equipment And Other [Member]
    
CASH FLOWS USED FOR INVESTING ACTIVITIES:    
Proceeds from disposition of property, plant, and equipment   2
Revenue Equipment [Member]
    
CASH FLOWS USED FOR INVESTING ACTIVITIES:    
Additions to property, plant, and equipment (66,115) (68,461)
Buildings And Land, Office Equipment And Other [Member]
    
CASH FLOWS USED FOR INVESTING ACTIVITIES:    
Additions to property, plant, and equipment $ (24,839) $ (9,646)