Stockholders' Equity (Roll Forward Of Class A Common Shares Outstanding) (Details)	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Stockholders' Equity [Abstract]
Balance at the beginning of the year	52,095,166	55,711,325
Repurchases	(264,567)	(1,100,000)
Stock option and ESPP issuances	76,063	158,764
Restricted share issuances	3,635	3,374
Restricted share forfeitures	(1,923)	(7,445)
Shares withheld for tax obligations	0	(35,157)
Balance at the end of the period	51,908,374	54,730,861