Net Income per Common Share - Components of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 29, 2019	Mar. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 29, 2019	Jun. 30, 2018
Net Income Per Common Share [Abstract]
Net income	$ 4,280	$ 25,418	$ 3,744	$ 20,548	$ 29,698	$ 24,292
Basic weighted-average shares outstanding	29,873,000		36,138,000		30,247,000	37,191,000
Dilutive effect of stock-based awards	658,000		706,000		887,000	905,000
Diluted weighted-average shares outstanding	30,531,000		36,844,000		31,134,000	38,096,000
Net income per share – basic	$ 0.14		$ 0.10		$ 0.98	$ 0.65
Net income per share – diluted	$ 0.14		$ 0.10		$ 0.95	$ 0.64