CONSOLIDATED STATEMENTS OF OPERATIONS CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Transportation	$ 9,685,415	$ 8,740,524	$ 7,575,659
Sourcing	1,620,183	1,535,528	1,643,174
Payment Services	53,515	60,294	55,472
Total revenues	11,359,113	10,336,346	9,274,305
Costs and expenses:
Purchased transportation and related services	8,157,278	7,296,608	6,302,530
Purchased products sourced for resale	1,483,745	1,407,080	1,503,797
Purchased payment services	519	0	0
Personnel expenses	766,006	696,233	632,064
Other selling, general, and administrative expenses	276,245	243,695	213,054
Total costs and expenses	10,683,793	9,643,616	8,651,445
Income from operations	675,320	692,730	622,860
Investment and other income	283,142	1,974	1,242
Income before provision for income taxes	958,462	694,704	624,102
Provision for income taxes	364,658	263,092	237,076
Net income	593,804	431,612	387,026
Other comprehensive loss	(230)	(2,690)	(4,789)
Comprehensive income	$ 593,574	$ 428,922	$ 382,237
Basic net income per share (in dollars per share)	$ 3.68	$ 2.63	$ 2.35
Diluted net income per share (in dollars per share)	$ 3.67	$ 2.62	$ 2.33
Basic weighted average shares outstanding	161,557	164,114	164,909
Dilutive effect of outstanding stock awards	389	627	1,063
Diluted weighted average shares outstanding	161,946	164,741	165,972