Other (Expense) Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Other Income and Expenses [Abstract]
Interest expense	$ (1,454)	$ (288)	$ (1,981)	$ (470)
Interest income	1	6	3	50
Other expense, net	$ (1,453)	$ (282)	$ (1,978)	$ (420)