Document and Entity Information Balance Sheet Parentheticals (USD $)	Apr. 01, 2014	Dec. 31, 2013
Treasury Stock, Shares	4,556,418	4,283,405
Common Class A [Member]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	112,500,000	112,500,000
Common Stock, Shares, Issued	30,584,002	30,573,851
Common Stock, Shares, Outstanding	26,027,584	26,290,446
Common Class B [Member]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Shares, Issued	1,381,865	1,382,393
Common Stock, Shares, Outstanding	1,381,865	1,382,393
Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	2,000,000	2,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0