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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenues        
Revenue $ 219,298 $ 196,318 $ 438,479 $ 369,884
Operating expenses:        
Salaries, wages, and related expenses 75,781 64,633 155,284 125,253
Fuel expense 29,215 29,209 57,047 56,390
Operations and maintenance 14,898 12,595 30,072 24,325
Revenue equipment rentals and purchased transportation 47,169 37,388 95,839 68,079
Operating taxes and licenses 3,365 2,613 6,549 5,273
Insurance and claims 10,472 9,908 21,707 18,593
Communications and utilities 1,760 1,666 3,478 3,406
General supplies and expenses 7,284 6,423 14,015 10,562
Depreciation and amortization, including gains and losses on disposition of property and equipment 20,510 17,818 40,218 37,513
Total operating expenses 210,454 182,253 424,209 349,394
Operating income 8,844 14,065 14,270 20,490
Interest expense, net 2,683 1,941 5,129 3,900
Income from equity method investment (2,375) (1,775) (5,410) (3,265)
Income before income taxes 8,536 13,899 14,551 19,855
Income tax expense 2,465 3,928 4,047 5,467
Net income $ 6,071 $ 9,971 $ 10,504 $ 14,388
Income per share:        
Basic and diluted income per share (in dollars per share) $ 0.33 $ 0.54 $ 0.57 $ 0.78
Basic weighted average shares outstanding (in shares) 18,438 18,337 18,410 18,334
Diluted weighted average shares outstanding (in shares) 18,606 18,441 18,570 18,424
Cargo and Freight [Member]        
Revenues        
Revenue $ 194,917 $ 170,635 $ 390,679 $ 321,097
Fuel Surcharge [Member]        
Revenues        
Revenue $ 24,381 $ 25,683 $ 47,800 $ 48,787