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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Income [Abstract]
Operating revenues	$ 509,587	$ 463,262	$ 1,494,913	$ 1,351,806
Operating expenses:
Salaries, wages and benefits	132,128	134,255	400,256	396,892
Fuel	103,777	75,986	312,210	228,319
Supplies and maintenance	44,334	40,730	128,608	117,418
Taxes and licenses	23,932	23,197	70,372	70,214
Insurance and claims	15,603	15,998	50,194	51,705
Depreciation	40,197	37,092	119,161	112,848
Rent and purchased transportation	100,081	91,795	287,183	268,361
Communications and utilities	3,846	4,013	11,612	11,256
Other	(4,377)	51	(8,958)	838
Total operating expenses	459,521	423,117	1,370,638	1,257,851
Operating income	50,066	40,145	124,275	93,955
Other expense (income):
Interest expense	5	5	43	17
Interest income	(337)	(432)	(1,027)	(1,124)
Other	52	(84)	341	(128)
Total other expense (income)	(280)	(511)	(643)	(1,235)
Income before income taxes	50,346	40,656	124,918	95,190
Income taxes	20,768	16,498	51,529	39,266
Net income	$ 29,578	$ 24,158	$ 73,389	$ 55,924
Earnings per share:
Basic	$ 0.41	$ 0.33	$ 1.01	$ 0.77
Diluted	$ 0.40	$ 0.33	$ 1.00	$ 0.77
Dividends declared per share	$ 0.050	$ 0.050	$ 0.150	$ 0.150
Weighted-average common shares outstanding:
Basic	72,811	72,549	72,770	72,279
Diluted	73,231	72,922	73,203	72,747

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