Benefit Plans (Schedule of Net Defined Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost	$ 110	$ 108
Interest cost	38	43
Amortization of net loss	17	46
Expected return on plan assets	(4)	(5)
Net defined benefit cost	$ 161	$ 192