Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 28, 2014		Sep. 29, 2013		Sep. 28, 2014		Sep. 29, 2013
Net income	$ 82,949		$ 69,459		$ 185,083		$ 142,604
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities arising during period, net of tax (benefit) expense of $(139), $358, $1,103, $(367)	(138)		623		2,166		(640)
Less: Reclassification adjustment for net gains included in net income, net of tax (benefit) of $(348), $(109), $(591), $(231)	(638)		(189)		(1,086)		(401)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(776)		434		1,080		(1,041)
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 (benefit) of $(42), $(40), $(127), $(119)	(74)	[1]	(69)	[1]	(221)	[1]	(207)	[1]
Other comprehensive income (loss)	(850)		365		859		(1,248)
Comprehensive income	$ 82,099		$ 69,824		$ 185,942		$ 141,356

[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."