Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 29, 2014		Jun. 30, 2013		Jun. 29, 2014		Jun. 30, 2013
Net income	$ 101,205		$ 66,556		$ 102,134		$ 73,145
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities arising during period, net of tax of $558, $(841), $1,242, $(726)	1,165		(1,463)		2,304		(1,263)
Less: Reclassification adjustment for net gains included in net income, net of tax of $(141), $(39), $(243), $(122)	(272)		(68)		(448)		(212)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	893		(1,531)		1,856		(1,475)
Defined benefit pension and post-retirement plans:
Amortization of net prior service benefit included in net periodic pension expense and post-retirement income, net of tax of $(42), $(40), $(85), $(79)	(74)	[1]	(69)	[1]	(147)	[1]	(138)	[1]
Other comprehensive income (loss)	819		(1,600)		1,709		(1,613)
Comprehensive income	$ 102,024		$ 64,956		$ 103,843		$ 71,532

[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note N: "Retirement Plans."