Unaudited Condensed Consolidated Statement of Partners' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Foreign currency translation adjustment, tax	$ 1,011	$ 1,334	$ (3,136)	$ 402
Unrealized loss on cash flow hedging derivatives, tax			$ 185	$ 501
Partnership distribution declared, amount per limited partnership unit	$ 1.50	$ 1.40	$ 1.50	$ 1.40