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Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |
Revenue from operations | $ 2,337,648 | $ 2,134,579 | $ 1,903,800
Operating expenses |  |  |
Salaries, wages and benefits | 1,170,773 | 1,066,551 | 956,079
Operating supplies and expenses | 385,201 | 378,534 | 355,186
General supplies and expenses | 69,765 | 58,908 | 49,900
Operating taxes and licenses | 71,599 | 67,526 | 63,284
Insurance and claims | 30,910 | 29,681 | 27,693
Communications and utilities | 23,142 | 19,980 | 18,104
Depreciation and amortization | 127,072 | 110,743 | 90,820
Purchased transportation | 106,435 | 94,522 | 84,516
Building and office equipment rents | 11,920 | 13,514 | 13,689
Miscellaneous expenses, net | 2,393 | 9,366 | 10,457
Total operating expenses | 1,999,210 | 1,849,325 | 1,669,728
Operating income | 338,438 | 285,254 | 234,072
Non-operating expense (income) |  |  |
Interest expense | 9,620 | 11,541 | 14,067
Interest income | (147) | (113) | (180)
Other expense, net | 279 | 728 | 101
Total non-operating expense | 9,752 | 12,156 | 13,988
Income before income taxes | 328,686 | 273,098 | 220,084
Provision for income taxes | 122,573 | 103,646 | 80,614
Net income | $ 206,113 | $ 169,452 | $ 139,470
Earnings per share |  |  |
Basic | $ 2.39 | $ 1.97 | $ 1.63
Diluted | $ 2.39 | $ 1.97 | $ 1.63
Weighted average shares outstanding |  |  |
Basic | 86,164,917 | 86,164,964 | 85,719,728
Diluted | 86,164,917 | 86,164,964 | 85,719,728

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