Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Total stock-based compensation expense	$ 3,658	$ 4,172	$ 6,742	$ 7,876
Income tax benefit	896	1,406	1,652	2,654
Total stock-based compensation expense, net of tax	2,762	2,766	5,090	5,222
Stock awards [Member]
Total stock-based compensation expense	2,996	3,584	5,488	6,720
Stock Options [Member]
Total stock-based compensation expense	$ 662	$ 588	$ 1,254	$ 1,156