Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Revenue	$ 841,726	$ 819,320	$ 2,472,489	$ 2,321,960
Investment income	350	332	1,043	1,027
Costs and expenses:
Purchased transportation	645,583	633,596	1,900,313	1,792,560
Commissions to agents	69,297	64,631	199,113	181,196
Other operating costs, net of gains on asset sales/dispositions	8,718	6,521	24,388	19,350
Insurance and claims	10,502	12,026	37,610	37,732
Selling, general and administrative	36,811	36,215	111,797	108,567
Depreciation and amortization	7,185	7,086	21,253	20,419
Total costs and expenses	778,096	760,075	2,294,474	2,159,824
Operating income	63,980	59,577	179,058	163,163
Interest and debt expense	714	774	2,208	2,260
Income before income taxes	63,266	58,803	176,850	160,903
Income taxes	23,918	22,048	67,016	60,585
Net income	$ 39,348	$ 36,755	$ 109,834	$ 100,318
Earnings per common share	$ 0.91	$ 0.82	$ 2.50	$ 2.23
Diluted earnings per share	$ 0.90	$ 0.82	$ 2.49	$ 2.22
Average number of shares outstanding:
Earnings per common share	43,446,000	44,713,000	43,975,000	45,018,000
Diluted earnings per share	43,607,000	44,937,000	44,134,000	45,222,000
Dividends per common share	$ 0.08	$ 0.07	$ 0.22	$ 0.19