Net Income per Common Share - Components of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Net Income Per Common Share [Abstract]
Net income	$ 25,418	$ 20,548
Basic weighted-average shares outstanding	30,620,000	38,244,000
Dilutive effect of stock-based awards	1,118,000	1,103,000
Diluted weighted-average shares outstanding	31,738,000	39,347,000
Net income per share – basic	$ 0.83	$ 0.54
Net income per share – diluted	$ 0.80	$ 0.52