Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 30, 2017	Sep. 24, 2016
Revenue	$ 943,430	$ 787,938	$ 2,594,772	$ 2,274,805
Investment income	711	357	1,733	1,100
Costs and expenses:
Purchased transportation	726,827	601,002	1,989,938	1,730,745
Commissions to agents	76,598	65,144	210,678	189,075
Other operating costs, net of gains on asset sales/dispositions	8,097	7,492	22,497	21,484
Insurance and claims	17,927	12,488	46,333	42,795
Selling, general and administrative	43,995	34,692	123,179	106,211
Depreciation and amortization	10,130	9,016	29,961	26,109
Total costs and expenses	883,574	729,834	2,422,586	2,116,419
Operating income	60,567	58,461	173,919	159,486
Interest and debt expense	657	948	2,559	2,725
Income before income taxes	59,910	57,513	171,360	156,761
Income taxes	17,490	21,235	59,047	58,985
Net income	42,420	36,278	112,313	97,776
Less: Net loss attributable to noncontrolling interest	(23)		(23)
Net income attributable to Landstar System, Inc. and subsidiary	$ 42,443	$ 36,278	$ 112,336	$ 97,776
Earnings per common share attributable to Landstar System, Inc. and subsidiary	$ 1.01	$ 0.86	$ 2.68	$ 2.32
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 1.01	$ 0.86	$ 2.67	$ 2.31
Average number of shares outstanding:
Earnings per common share	41,957,000	42,039,000	41,924,000	42,223,000
Diluted earnings per share	42,028,000	42,170,000	42,013,000	42,341,000
Dividends per common share	$ 0.10	$ 0.09	$ 0.28	$ 0.25