Defined Benefit Pension Plans (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 03, 2015	Jul. 04, 2014	Jul. 03, 2015	Jul. 04, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 107	$ 117	$ 214	$ 233
Interest cost		19	36	38	71
Expected return on plan assets		(21)	(28)	(42)	(55)
Net amortization of transitional obligation (a)	[1]	3	0	5	0
Actuarial loss, recognized in current period (a)	[1]	12	6	25	12
Net periodic pension cost		$ 120	$ 131	$ 240	$ 261

[1] Amounts reclassified from accumulated other comprehensive income.