Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Net income	$ 69,459	$ 88,641	$ 142,604	$ 233,592
Other comprehensive income:
Net unrealized gains (losses) on marketable securities arising during period	887	1,259	(1,019)	2,455
Less: Reclassification adjustment for net gains included in net income	(202)	(93)	(621)	(583)
Net change	685	1,166	(1,640)	1,872
Defined benefit pension and post-retirement plans:
Amortization of prior service net benefit included in net periodic pension cost and post-retirement benefit	(109)	(92)	(325)	(275)
Other comprehensive income (loss)	576	1,074	(1,965)	1,597
Comprehensive income	$ 70,035	$ 89,715	$ 140,639	$ 235,189