Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Net income (loss)	$ (72)	$ 4,163	$ (2,812)	$ 815
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	2,810	(380)	(5,533)	(95)
Adjustments related to postretirement benefits	(77)	(124)	(132)	(80)
Other comprehensive income (loss), net of tax	2,733	(504)	(5,665)	(175)
Comprehensive income (loss)	$ 2,661	$ 3,659	$ (8,477)	$ 640