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Earnings (Loss) Per Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       641,857
Common shares issuable on an if-converted basis adjusted to diluted EPS     11,333,333  
Options Held [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,176,284 1,850,009 3,176,284 2,032,158
Stock Options And Restricted Stock Units [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 187,516 574,865