Significant Accounting Policies (Details 3) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015 USD ($) item	Jun. 29, 2014 USD ($)	Jun. 28, 2015 USD ($) item	Jun. 29, 2014 USD ($)
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	$ 6,900		$ 6,900
Redeemable Noncontrolling Interests
Balance at the beginning of the period			8,555
Change in redemption value	73	$ (31)	143	$ (39)
Balance at the end of the period	7,741		7,741
Redeemable noncontrolling interests
Redeemable Noncontrolling Interests
Balance at the beginning of the period			8,555
Net income			2,329
Distributions			(3,000)
Change in redemption value			(143)
Balance at the end of the period	$ 7,741		$ 7,741