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Statements Of Operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Revenue from operations | $ 3,358,112 | $ 2,991,517 | $ 2,972,442
Operating expenses |  |  |
Salaries, wages and benefits | 1,802,440 | 1,652,055 | 1,569,791
Operating supplies and expenses | 381,798 | 322,997 | 353,889
General supplies and expenses | 107,733 | 86,626 | 89,308
Operating taxes and licenses | 99,778 | 92,426 | 93,292
Insurance and claims | 41,718 | 37,861 | 37,368
Communications and utilities | 27,754 | 27,904 | 26,913
Depreciation and amortization | 205,763 | 189,867 | 165,343
Purchased transportation | 84,747 | 74,051 | 116,300
Building and office equipment rents | 7,984 | 7,920 | 9,620
Miscellaneous expenses, net | 22,511 | 15,975 | 12,378
Total operating expenses | 2,782,226 | 2,507,682 | 2,474,202
Operating income | 575,886 | 483,835 | 498,240
Non-operating expense (income) |  |  |
Interest expense | 2,154 | 4,332 | 5,210
Interest income | (740) | (58) | (209)
Other expense, net | (1,360) | 1,974 | 3,222
Total non-operating expense | 54 | 6,248 | 8,223
Income before income taxes | 575,832 | 477,587 | 490,017
Provision for income taxes | 112,058 | 181,822 | 185,327
Net income | $ 463,774 | $ 295,765 | $ 304,690
Earnings per share |  |  |
Basic | $ 5.63 | $ 3.56 | $ 3.57
Diluted | $ 5.63 | $ 3.56 | $ 3.57
Weighted average shares outstanding |  |  |
Basic | 82,308,417 | 83,112,012 | 85,378,480
Diluted | 82,407,068 | 83,153,659 | 85,378,480
Common Stock, Dividends, Per Share, Declared | $ 0.40 | $ 0.00 | $ 0.00

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