Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2021	Jun. 26, 2020	Jun. 25, 2021	Jun. 26, 2020
Earnings Per Share [Abstract]
Net loss attributable to Company	$ (1,044)	$ (3,213)	$ (7,058)	$ (22,207)
Weighted average shares outstanding, basic (in shares)	59,217,000	58,885,000	59,217,000	58,513,000
Weighted average shares outstanding, diluted (in shares)	59,217,000	58,885,000	59,217,000	58,513,000
Net loss per share, basic (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.12)	$ (0.38)
Net loss per share, diluted (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.12)	$ (0.38)