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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 29, 2019
Convertible Preferred Stock    
Preferred Stock, par value (in dollars per share) $ 100.00 $ 100.00
Preferred Stock, shares authorized (in shares) 50,000 50,000
Preferred Stock, shares issued (in shares) 0 0
Nonconvertible Preferred Stock    
Preferred Stock, par value (in dollars per share) $ 100.00 $ 100.00
Preferred Stock, shares authorized (in shares) 50,000 50,000
Preferred Stock, shares issued (in shares) 0 0
Preferred Stock    
Preferred Stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred Stock, shares issued (in shares) 0 0
Common Stock    
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 10,203,821 10,203,821
Treasury stock, shares (in shares) 3,062,374 3,062,374
Class B Common Stock    
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 2,860,356 2,860,356
Treasury stock, shares (in shares) 628,114 628,114
Class C Common Stock    
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 0 0