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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Operating Revenue $ 410,584 $ 392,805
Operating Expenses:    
Salaries, wages and employees’ benefits 220,352 211,124
Purchased transportation 28,418 29,916
Fuel, operating expenses and supplies 83,543 78,794
Operating taxes and licenses 13,202 12,150
Claims and insurance 9,530 10,191
Depreciation and amortization 26,782 23,030
Loss from property disposals, net 126 21
Total operating expenses 381,953 365,226
Operating Income 28,631 27,579
Nonoperating Expenses (Income):    
Interest expense 1,383 1,226
Other, net (334) (103)
Nonoperating expenses, net 1,049 1,123
Income Before Income Taxes 27,582 26,456
Income Tax Provision 5,323 5,331
Net Income $ 22,259 $ 21,125
Weighted average common shares outstanding – basic 25,873 25,698
Weighted average common shares outstanding – diluted 26,322 26,308
Basic Earnings Per Share $ 0.86 $ 0.82
Diluted Earnings Per Share $ 0.85 $ 0.80