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Net Income Per Share (Schedule of Debt Conversions) (Details) - Convertible Debt - $ / shares
Jan. 01, 2021
May 31, 2020
Apr. 03, 2020
Feb. 29, 2020
Jan. 03, 2020
2.5% Convertible Senior Notes due April 1, 2022          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Conversion price (in dollars per share)         $ 16.77
Stated interest rate       2.50% 2.50%
2.0% Convertible Senior Notes due August 15, 2022          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Conversion price (in dollars per share) $ 10.23 $ 19.25     $ 20.41
Stated interest rate 2.00% 2.00% 2.00% 2.00%  
New 2.5% Convertible Senior Notes due April 1, 2022          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Conversion price (in dollars per share) $ 16.77        
Stated interest rate 2.50%        
New 2.0% Convertible Senior Notes due August 15, 2022          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Conversion price (in dollars per share) $ 20.41        
Stated interest rate 2.00%