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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue:        
Total revenue $ 196,318 $ 164,326 $ 369,884 $ 323,070
Operating expenses:        
Salaries, wages, and related expenses 64,633 58,584 125,253 117,908
Fuel expense 29,209 24,911 56,390 50,313
Operations and maintenance 12,595 12,044 24,325 24,457
Revenue equipment rentals and purchased transportation 37,388 28,987 68,079 54,358
Operating taxes and licenses 2,613 2,097 5,273 4,832
Insurance and claims 9,908 7,914 18,593 16,632
Communications and utilities 1,666 1,706 3,406 3,334
General supplies and expenses 6,423 3,462 10,562 7,190
Depreciation and amortization, including gains and losses on disposition of property and equipment 17,818 20,659 37,513 39,775
Total operating expenses 182,253 160,364 349,394 318,799
Operating income 14,065 3,962 20,490 4,271
Interest expense, net 1,941 1,961 3,900 4,041
Income from equity method investment (1,775) (800) (3,265) (1,825)
Income before income taxes 13,899 2,801 19,855 2,055
Income tax expense 3,928 1,253 5,467 545
Net income $ 9,971 $ 1,548 $ 14,388 $ 1,510
Income per share:        
Basic and diluted net income per share (in dollars per share) $ 0.54 $ 0.08 $ 0.78 $ 0.08
Basic weighted average shares outstanding (in shares) 18,337 18,281 18,334 18,269
Diluted weighted average shares outstanding (in shares) 18,441 18,359 18,424 18,347
Cargo and Freight [Member]        
Revenue:        
Total revenue $ 170,635 $ 145,586 $ 321,097 $ 285,712
Fuel Surcharge [Member]        
Revenue:        
Total revenue $ 25,683 $ 18,740 $ 48,787 $ 37,358