Other (Income) Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Other operating (income) expense, net:
Gain on property, plant and equipment disposals	$ (79)	$ (15)	$ (187)	$ (18)
Loss on currency exchanges	85	116	530	342
Amortization of intangibles	76	105	229	255
Retirement expenses	83	48	173	94
Miscellaneous (income) expense	(34)	(24)	(61)	(72)
Other operating (income) expense, net	$ 131	$ 230	$ 684	$ 601