Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Revenue, before fuel surcharge		$ 469,683	$ 256,243	$ 961,685	$ 763,684
Fuel surcharge		51,925	24,287	104,348	65,252
Total revenue		521,608	280,530	1,066,033	828,936
Operating expenses:
Salaries, wages and benefits		154,390	82,688	316,844	250,732
Fuel		62,300	34,616	131,252	94,815
Operations and maintenance		37,267	19,781	78,516	56,886
Insurance and claims		21,117	9,251	37,982	26,330
Operating taxes and licenses		8,793	4,546	17,839	14,645
Communications		1,921	976	4,125	3,224
Depreciation and amortization of property and equipment		43,477	29,004	102,280	86,111
Amortization of intangibles		2,654	125	2,904	375
Rental expense		15,388	1,279	17,939	3,724
Purchased transportation		127,434	57,069	244,358	168,772
Impairments		16,746	0	16,746	0
Miscellaneous operating expenses, net		11,972	4,261	21,873	9,580
Merger-related costs		12,338	0	16,516	0
Total operating expenses		515,797	243,596	1,009,174	715,194
Operating income		5,811	36,934	56,859	113,742
Other income (expense):
Interest income		370	83	559	259
Interest expense		(1,812)	(182)	(1,948)	(742)
Other (expense) income, net		(1,442)	1,389	(120)	4,602
Total other (expense) income		(2,884)	1,290	(1,509)	4,119
Income before income taxes		2,927	38,224	55,350	117,861
Income taxes (benefit) expense		(1,272)	14,141	17,786	45,095
Net income		4,199	24,083	37,564	72,766
Net income attributable to noncontrolling interest		(318)	(316)	(836)	(1,064)
Net income attributable to Knight-Swift	[1]	$ 3,881	$ 23,767	$ 36,728	$ 71,702
Earnings per share:
Basic (in dollars per share)		$ 0.04	$ 0.30	$ 0.42	$ 0.89
Diluted (in dollars per share)		0.04	0.29	0.41	0.88
Dividends declared per share: (in dollars per share)		$ 0.06	$ 0.06	$ 0.18	$ 0.18
Weighted average shares outstanding:
Basic (in shares)		102,846	80,040	87,978	80,284
Diluted (in shares)		103,752	80,949	88,847	81,112

[1] early adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting during the fourth quarter of 2016. The adoption of this standard resulted in the recognition of $1.8 million of excess tax benefits to the income tax provision for the year ended December 31, 2016. Net income and shares outstanding data for the quarter ended and year-to-date September 30, 2016 are presented as if the ASU was adopted at the beginning of 2016.