Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total revenues	$ 6,798,475	$ 5,532,726	$ 13,614,428	$ 10,336,595
Costs and expenses:
Personnel expenses	444,764	362,901	858,125	723,736
Other selling, general, and administrative expenses	117,184	125,671	264,545	243,887
Total costs and expenses	6,328,810	5,272,122	12,799,289	9,852,662
Income from operations	469,665	260,604	815,139	483,933
Interest and other income/expense, net	(27,395)	(13,497)	(41,569)	(24,757)
Income before provision for income taxes	442,270	247,107	773,570	459,176
Provision for income taxes	94,085	53,318	155,037	92,082
Net income	348,185	193,789	618,533	367,094
Other comprehensive loss, net of tax	(33,596)	(162)	(26,726)	(7,448)
Comprehensive income	$ 314,589	$ 193,627	$ 591,807	$ 359,646
Basic net income per share (in dollars per share)	$ 2.71	$ 1.45	$ 4.78	$ 2.74
Diluted net income per share (in dollars per share)	$ 2.67	$ 1.44	$ 4.71	$ 2.71
Basic weighted average shares outstanding (shares)	128,405	133,275	129,447	133,888
Dilutive effect of outstanding stock awards (shares)	1,933	1,581	1,771	1,388
Diluted weighted average shares outstanding (shares)	130,338	134,856	131,218	135,276
Transportation
Revenues:
Total revenues	$ 6,465,642	$ 5,240,448	$ 12,993,993	$ 9,800,675
Costs and expenses:
Purchased products and services	5,466,874	4,519,305	11,117,098	8,400,590
Sourcing
Revenues:
Total revenues	332,833	292,278	620,435	535,920
Costs and expenses:
Purchased products and services	$ 299,988	$ 264,245	$ 559,521	$ 484,449