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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Statement [Abstract] |  |  |
Revenue from operations | $ 2,110,483 | $ 1,882,541 | $ 1,480,998
Operating expenses |  |  |
Salaries, wages and benefits | 1,066,551 | 956,079 | 808,819
Operating supplies and expenses | 378,534 | 355,186 | 244,291
General supplies and expenses | 58,908 | 49,900 | 41,580
Operating taxes and licenses | 67,526 | 63,284 | 55,420
Insurance and claims | 29,681 | 27,693 | 25,329
Communications and utilities | 19,980 | 18,104 | 15,218
Depreciation and amortization | 110,743 | 90,820 | 80,362
Purchased transportation | 70,426 | 63,257 | 50,489
Building and office equipment rents | 13,514 | 13,689 | 15,244
Miscellaneous expenses, net | 9,366 | 10,457 | 6,507
Total operating expenses | 1,825,229 | 1,648,469 | 1,343,259
Operating income | 285,254 | 234,072 | 137,739
Non-operating expense (income) |  |  |
Interest expense | 11,541 | 14,067 | 12,613
Interest income | (113) | (180) | (148)
Other expense, net | 728 | 101 | 848
Total non-operating expense | 12,156 | 13,988 | 13,313
Income before income taxes | 273,098 | 220,084 | 124,426
Provision for income taxes | 103,646 | 80,614 | 48,775
Net income | $ 169,452 | $ 139,470 | $ 75,651
Earnings per share |  |  |
Basic | $ 1.97 | $ 1.63 | $ 0.90
Diluted | $ 1.97 | $ 1.63 | $ 0.90
Weighted average shares outstanding |  |  |
Basic | 86,164,964 | 85,719,728 | 83,890,483
Diluted | 86,164,964 | 85,719,728 | 83,890,483

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