Earnings Per Share - Reconciliation of Basic and Diluted EPS Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Jun. 29, 2019	Mar. 30, 2019	Jun. 27, 2020	Jun. 29, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ (43,833)	$ 9,742	$ 10,257	$ 17,429	$ (34,091)	$ 27,686
Weighted average shares outstanding for basic EPS (shares)	80,325		78,318		80,226	78,262
Effect of dilutive securities:
Stock options (shares)	0		3,059		0	3,135
Restricted stock (shares)	0		47		0	40
Weighted average shares outstanding for diluted EPS	80,325		81,424		80,226	81,437
Basic EPS (in usd per share)	$ (0.55)		$ 0.13		$ (0.42)	$ 0.35
Diluted EPS (in usd per share)	$ (0.55)		$ 0.13		$ (0.42)	$ 0.34
Options and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options, RSUs outstanding excluded from EPS (shares)	2,458		391		2,512	391