Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Total revenues	$ 4,421,856	$ 6,798,475	$ 9,033,526	$ 13,614,428
Costs and expenses:
Personnel expenses	377,277	444,764	760,383	858,125
Other selling, general, and administrative expenses	155,596	117,184	297,097	264,545
Total costs and expenses	4,289,233	6,328,810	8,739,870	12,799,289
Income from operations	132,623	469,665	293,656	815,139
Interest and other income/expense, net	(18,259)	(27,395)	(46,524)	(41,569)
Income before provision for income taxes	114,364	442,270	247,132	773,570
Provision for income taxes	17,048	94,085	34,925	155,037
Net income	97,316	348,185	212,207	618,533
Other comprehensive loss	(6,536)	(33,596)	(4,059)	(26,726)
Comprehensive income	$ 90,780	$ 314,589	$ 208,148	$ 591,807
Basic net income per share (in dollars per share)	$ 0.82	$ 2.71	$ 1.79	$ 4.78
Diluted net income per share (in dollars per share)	$ 0.81	$ 2.67	$ 1.77	$ 4.71
Basic weighted average shares outstanding (shares)	118,500	128,405	118,567	129,447
Dilutive effect of outstanding stock awards (shares)	1,307	1,933	1,253	1,771
Diluted weighted average shares outstanding (shares)	119,807	130,338	119,820	131,218
Transportation
Revenues:
Total revenues	$ 4,084,827	$ 6,465,642	$ 8,412,792	$ 12,993,993
Costs and expenses:
Purchased products and services	3,453,560	5,466,874	7,124,591	11,117,098
Sourcing
Revenues:
Total revenues	337,029	332,833	620,734	620,435
Costs and expenses:
Purchased products and services	$ 302,800	$ 299,988	$ 557,799	$ 559,521