Stock-Based Compensation (Details 5) - $ / shares shares 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	Dec. 31, 2012
RSUs Vested
Common Stock, Dividends, Per Share, Cash Paid	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.13	$ 0.66	$ 0.58	$ 0.50
Class A
RSUs Vested
Common Stock, Dividends, Per Share, Cash Paid									0.66	0.58	0.50
Class B
RSUs Vested
Common Stock, Dividends, Per Share, Cash Paid									$ 0.66	$ 0.58	$ 0.50
Management Stock Purchase Plan | Restricted stock units (RSUs)
RSUs Outstanding
Number Outstanding (in shares)	101				80				101	80	132	196
Weighted Average Purchase Price (in dollars per share)	$ 36.14				$ 32.08				$ 36.14	$ 32.08	$ 27.46	$ 22.88
RSUs Vested
Number Vested (in shares)	25				31				25	31	42
Weighted Average Purchase Price (in dollars per share)	$ 33.35				$ 27.96				$ 33.35	$ 27.96	$ 25.30
$19.87-$25.15 | Management Stock Purchase Plan | Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									19.87
High end of purchase price range (in dollars per share)									$ 25.15
RSUs Outstanding
Number Outstanding (in shares)	1								1
Weighted Average Purchase Price (in dollars per share)	$ 25.15								$ 25.15
RSUs Vested
Number Vested (in shares)	1								1
Weighted Average Purchase Price (in dollars per share)	$ 25.15								$ 25.15
$26.51-$31.63 | Management Stock Purchase Plan | Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									26.51
High end of purchase price range (in dollars per share)									$ 31.63
RSUs Outstanding
Number Outstanding (in shares)	26								26
Weighted Average Purchase Price (in dollars per share)	$ 31.43								$ 31.43
RSUs Vested
Number Vested (in shares)	18								18
Weighted Average Purchase Price (in dollars per share)	$ 31.35								$ 31.35
$37.13-$40.27 | Management Stock Purchase Plan | Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									37.13
High end of purchase price range (in dollars per share)									$ 40.27
RSUs Outstanding
Number Outstanding (in shares)	74								74
Weighted Average Purchase Price (in dollars per share)	$ 37.92								$ 37.92
RSUs Vested
Number Vested (in shares)	6								6
Weighted Average Purchase Price (in dollars per share)	$ 40.27								$ 40.27