Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
REVENUES:
Transportation	$ 2,476,805	$ 2,269,036	$ 4,653,602	$ 4,260,058
Sourcing	462,597	423,536	822,327	783,564
Payment Services	16,312	15,090	31,899	29,512
Total revenues	2,955,714	2,707,662	5,507,828	5,073,134
COSTS AND EXPENSES:
Purchased transportation and related services	2,107,799	1,901,189	3,917,380	3,549,291
Purchased products sourced for resale	422,392	388,607	750,179	715,636
Personnel expenses	177,184	178,945	360,622	354,054
Other selling, general, and administrative expenses	63,425	58,826	125,188	117,343
Total costs and expenses	2,770,800	2,527,567	5,153,369	4,736,324
Income from operations	184,914	180,095	354,459	336,810
Investment and other income	686	326	900	551
Income before provision for income taxes	185,600	180,421	355,359	337,361
Provision for income taxes	71,018	69,398	134,277	129,310
Net income	114,582	111,023	221,082	208,051
Other comprehensive (loss) income	(2,857)	635	(2,630)	(465)
Comprehensive income	$ 111,725	$ 111,658	$ 218,452	$ 207,586
Basic net income per share	$ 0.71	$ 0.67	$ 1.36	$ 1.26
Diluted net income per share	$ 0.71	$ 0.67	$ 1.36	$ 1.26
Basic weighted average shares outstanding	161,887	164,607	162,290	164,847
Dilutive effect of outstanding stock awards	313	587	353	614
Diluted weighted average shares outstanding	162,200	165,194	162,643	165,461