Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Total revenues	$ 3,805,008	$ 3,751,210
Costs and expenses:
Personnel expenses	330,220	340,098
Other selling, general, and administrative expenses	128,293	114,152
Total costs and expenses	3,695,568	3,526,660
Income from operations	109,440	224,550
Interest and other expense	(15,228)	(17,140)
Income before provision for income taxes	94,212	207,410
Provision for income taxes	16,066	45,622
Net income	78,146	161,788
Other comprehensive (loss) income, net of tax	(32,195)	5,297
Comprehensive income	$ 45,951	$ 167,085
Basic net income per share (in dollars per share)	$ 0.58	$ 1.17
Diluted net income per share (in dollars per share)	$ 0.57	$ 1.16
Basic weighted average shares outstanding (shares)	135,474	137,854
Dilutive effect of outstanding stock awards (shares)	495	1,101
Diluted weighted average shares outstanding (shares)	135,969	138,955
Transportation
Revenues:
Total revenues	$ 3,542,118	$ 3,504,932
Costs and expenses:
Purchased products and services	3,000,113	2,853,256
Sourcing
Revenues:
Total revenues	262,890	246,278
Costs and expenses:
Purchased products and services	$ 236,942	$ 219,154