Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation	$ 1,531	$ 723	$ 4,501	$ 2,509
Unrecognized Stock-Based Compensation Expense, Non-vested Shares	7,100		$ 7,100
Weighted Average Remaining Vesting Period, Non-Vested Shares			1 year 8 months 12 days
Expected Stock-Based Compensation, Remainder of Fiscal Year	$ 1,200		$ 1,200