Income Taxes (Components Of Income Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Domestic									$ 1,101,427	$ 1,196,335	$ 1,042,317
Foreign									48,736	86,985	71,988
Income before provision for income taxes	$ 60,600	$ 214,200	$ 464,000	$ 411,400	$ 99,900	$ 225,500	$ 549,100	$ 408,900	$ 1,150,163	$ 1,283,320	$ 1,114,305