Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Net income (loss)	$ 1,113	$ 7,519	$ (1,699)	$ 8,334
Other comprehensive loss, net of tax
Foreign currency translation adjustments	(4,221)	(8,537)	(9,754)	(8,632)
Adjustments related to postretirement benefits	99	(92)	(33)	(172)
Other comprehensive loss, net of tax	(4,122)	(8,629)	(9,787)	(8,804)
Comprehensive loss	$ (3,009)	$ (1,110)	$ (11,486)	$ (470)