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Earnings (Loss) Per Share (Disclosure of basic and diluted earnings (loss) per share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Numerator for basic earnings (loss) per share:        
Earnings (loss) from continuing operations $ (3,034) $ (3,875) $ (2,280) $ (12,972)
Less: dividends and accretion (748) (2,844) (3,445) (7,473)
Earnings from discontinued operations 0 3,964 0 17,429
Loss attributable to common shareholders $ (3,782) $ (2,755) $ (5,725) $ (3,016)
Denominator for basic earnings (loss) per share:        
Basic weighted-average number of shares outstanding 107,255 89,635 103,017 88,962
From continuing operations $ (0.04) $ (0.07) $ (0.06) $ (0.23)
From discontinued operations 0 0.04 0 0.20
Basic earnings (loss) per share $ (0.04) $ (0.03) $ (0.06) $ (0.03)
Numerator for diluted earnings (loss) per share:        
Earnings (loss) from continuing operations $ (3,034) $ (3,875) $ (2,280) $ (12,972)
Loss from continuing operations attributable to common shareholders (3,782) (6,719) (5,725) (20,445)
Earnings from discontinued operations 0 3,964 0 17,429
Earnings (loss) attributable to common shareholders $ (3,782) $ (2,755) $ (5,725) $ (3,016)
Denominator for diluted earnings (loss) per share:        
Basic weighted-average number of shares outstanding 107,255 89,635 103,017 88,962
Dilutive effect of the following:        
Diluted weighted-average number of shares outstanding 107,255 89,635 103,017 88,962
From continuing operations $ (0.04) $ (0.07) $ (0.06) $ (0.23)
From discontinued operations 0 0.04 0 0.20
Diluted loss per share $ (0.04) $ (0.03) $ (0.06) $ (0.03)
Series A Preferred Stock [Member]        
Numerator for basic earnings (loss) per share:        
Less: dividends and accretion $ 0 $ (2,110) $ (1,212) $ (6,201)
Numerator for diluted earnings (loss) per share:        
Less: dividends and accretion on Preferred Stock $ 0 $ (2,110) $ (1,212) $ (6,201)
Dilutive effect of the following:        
Diluted weighted-average number of shares outstanding 0 0 0 0
Series B Preferred Stock [Member]        
Numerator for basic earnings (loss) per share:        
Less: dividends and accretion $ (748) $ (734) $ (2,233) $ (1,272)
Numerator for diluted earnings (loss) per share:        
Less: dividends and accretion on Preferred Stock $ (748) $ (734) $ (2,233) $ (1,272)
Dilutive effect of the following:        
Diluted weighted-average number of shares outstanding 0 0 0 0
Stock options and restricted stock units [Member]        
Dilutive effect of the following:        
Diluted weighted-average number of shares outstanding 0 0 0 0