Significant Accounting Policies (Details 3) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015 USD ($) item	Sep. 28, 2014 USD ($)	Sep. 27, 2015 USD ($) item	Sep. 28, 2014 USD ($)
Significant Accounting Policies
Number of joint ventures under which noncontrolling interest holders have the option to require the Company to purchase their interests | item	2		2
Net deferred tax liability, net	$ 1,200		$ 1,200
Redeemable Noncontrolling Interests
Balance at the beginning of the period			8,555
Change in redemption value	49	$ (42)	192	$ (81)
Balance at the end of the period	8,274		8,274
Redeemable noncontrolling interests
Redeemable Noncontrolling Interests
Balance at the beginning of the period			8,555
Net income			2,915
Distributions			(3,004)
Change in redemption value			(192)
Balance at the end of the period	$ 8,274		$ 8,274