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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue:        
Freight revenue $ 142,034 $ 134,362 $ 405,985 $ 398,527
Fuel surcharge revenue 35,547 36,481 106,207 109,534
Total revenue 177,581 170,843 512,192 508,061
Operating expenses:        
Salaries, wages, and related expenses 57,636 53,728 166,651 163,602
Fuel expense 42,784 46,540 127,875 141,734
Operations and maintenance 11,934 13,077 35,498 37,460
Revenue equipment rentals and purchased transportation 25,871 26,207 78,818 75,668
Operating taxes and licenses 2,733 2,780 8,041 8,215
Insurance and claims 15,545 6,887 29,229 22,647
Communications and utilities 1,457 1,363 4,320 3,899
General supplies and expenses 3,950 3,882 12,289 12,182
Depreciation and amortization, including gains and losses on disposition of property and equipment 10,085 10,497 34,476 31,137
Total operating expenses 171,995 164,961 497,197 496,544
Operating income 5,586 5,882 14,995 11,517
Other expenses (income):        
Interest expense 2,635 2,386 8,108 7,636
Interest income (1) (1) (10) (3)
Other expenses, net 2,634 2,385 8,098 7,633
Equity in income of affiliate 880 1,150 2,530 2,180
Income before income taxes 3,832 4,647 9,427 6,064
Income tax expense 1,975 2,674 5,164 4,159
Net income $ 1,857 $ 1,973 $ 4,263 $ 1,905
Income per share:        
Basic net income per share (in Dollars per share) $ 0.12 $ 0.13 $ 0.29 $ 0.13
Diluted net income per share (in Dollars per share) $ 0.12 $ 0.13 $ 0.28 $ 0.13
Basic weighted average shares outstanding (in Shares) 14,959 14,864 14,935 14,827
Diluted weighted average shares outstanding (in Shares) 15,145 15,043 15,166 15,023