Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 31, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components Of Income Tax Expense Benefit [Line Items]
Current income tax provision (benefit)									$ 12,086	$ 5,730	$ 2,314
Deferred income tax provision (benefit)									(1,692)	(6,736)	3,886
Income Tax Provision (benefit)	$ (168)	$ 2,452	$ 6,310	$ 1,800	$ (6,013)	$ 2,013	$ 2,057	$ 937	10,394	(1,006)	6,200
CANADA
Components Of Income Tax Expense Benefit [Line Items]
Current income tax provision (benefit)									96	175	0
Deferred income tax provision (benefit)									0	0	0
UNITED STATES
Components Of Income Tax Expense Benefit [Line Items]
Current income tax provision (benefit)									8,136	3,615	1,662
Deferred income tax provision (benefit)									(3,239)	(6,731)	2,206
Other Countries
Components Of Income Tax Expense Benefit [Line Items]
Current income tax provision (benefit)									3,854	1,940	652
Deferred income tax provision (benefit)									$ 1,547	$ (5)	$ 1,680