Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Jan. 01, 2017
Convertible Preferred Stock [Member]
Preferred Stock, par value	$ 100.00	$ 100.00
Preferred Stock, shares authorized	50,000	50,000
Preferred Stock, shares issued	0	0
Nonconvertible Preferred Stock [Member]
Preferred Stock, par value	$ 100.00	$ 100.00
Preferred Stock, shares authorized	50,000	50,000
Preferred Stock, shares issued	0	0
Preferred Stock [Member]
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	20,000,000	20,000,000
Preferred Stock, shares issued	0	0
Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	10,203,821	10,203,821
Treasury stock, shares	3,062,374	3,062,374
Class B Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	2,820,836	2,799,816
Treasury stock, shares	628,114	628,114
Class C Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	0	0