(Loss) Earnings Per Share (Antidilutive Securities) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Stock options [Member]
Antidilutive securities excluded from computation of earnings per share [Line Items]
Antidilutive securities not included in the computation of (loss) earnings per share	4,665	3,384
Nonvested restricted stock units [Member]
Antidilutive securities excluded from computation of earnings per share [Line Items]
Antidilutive securities not included in the computation of (loss) earnings per share	651	222
Nonvested performance-based share units [Member]
Antidilutive securities excluded from computation of earnings per share [Line Items]
Antidilutive securities not included in the computation of (loss) earnings per share	533	260