Net Income per Common Share - Components of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 28, 2019	Sep. 29, 2018
Net Income Per Common Share [Abstract]
Net income	$ 28,054	$ 4,280	$ 25,418	$ 18,257	$ 3,744	$ 20,548	$ 57,752	$ 42,549
Basic weighted-average shares outstanding	29,085,000			34,231,000			29,859,000	36,204,000
Dilutive effect of stock-based awards	711,000			808,000			829,000	873,000
Diluted weighted-average shares outstanding	29,796,000			35,039,000			30,688,000	37,077,000
Net income per share – basic	$ 0.96			$ 0.53			$ 1.93	$ 1.18
Net income per share – diluted	$ 0.94			$ 0.52			$ 1.88	$ 1.15