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Significant Accounting Policies (Details 3) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 28, 2014
item
Dec. 29, 2013
Sep. 28, 2014
Redeemable noncontrolling interests
Significant Accounting Policies      
Number of joint ventures under which noncontrolling interest holders have the option to require the Company to purchase their interests 2    
Redeemable Noncontrolling Interests      
Balance at the beginning of the period $ 8,970 $ 7,024 $ 7,024
Net income     1,865
Change in redemption value     81
Balance at the end of the period $ 8,970 $ 7,024 $ 8,970