CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total revenues	$ 16,631,172	$ 14,869,380	$ 13,144,413
Costs and expenses:
Personnel expenses	1,343,542	1,179,527	1,064,936
Other selling, general, and administrative expenses	449,610	413,404	375,061
Total costs and expenses	15,719,089	14,094,261	12,306,882
Income from operations	912,083	775,119	837,531
Interest and other expenses	(31,810)	(46,656)	(25,581)
Income before provision for income taxes	880,273	728,463	811,950
Provision for income taxes	215,768	223,570	298,566
Net income	664,505	504,893	513,384
Other comprehensive (loss) income	(53,475)	42,982	(23,496)
Comprehensive income	$ 611,030	$ 547,875	$ 489,888
Basic net income per share (in dollars per share)	$ 4.78	$ 3.59	$ 3.60
Diluted net income per share (in dollars per share)	$ 4.73	$ 3.57	$ 3.59
Basic weighted average shares outstanding (in shares)	139,010	140,610	142,706
Dilutive effect of outstanding stock awards (in shares)	1,395	772	285
Diluted weighted average shares outstanding (in shares)	140,405	141,382	142,991
Transportation
Revenues:
Total revenues	$ 15,515,921	$ 13,502,906	$ 11,704,745
Costs and expenses:
Purchased services and products	12,922,177	11,257,290	9,549,934
Sourcing
Revenues:
Total revenues	1,115,251	1,366,474	1,439,668
Costs and expenses:
Purchased services and products	$ 1,003,760	$ 1,244,040	$ 1,316,951