CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Net income	$ 88,641	$ 56,706	$ 233,592	$ 240,802
Other comprehensive income (loss), net of tax:
Foreign currency translation reclassification adjustment included in net income				2,266
Unrealized gains on marketable securities:
Unrealized gains on marketable securities arising during period	1,259	436	2,455	2,058
Less: Reclassification adjustment for gains included in net income	(93)	(1,493)	(583)	(1,802)
Unrealized gains on marketable securities	1,166	(1,057)	1,872	256
Defined benefit pension and post-retirement plans:
Amortization of prior service (benefit) cost included in net periodic pension and post-retirement costs	(92)	5	(275)	17
Other comprehensive income	1,074	(1,052)	1,597	2,539
Comprehensive income	$ 89,715	$ 55,654	$ 235,189	$ 243,341