CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Preferred Stock, par value per share	$ 5.00	$ 5.00
Preferred Stock, shares authorized	2,000,000	2,000,000
Preferred Stock, shares issued	0	0
Treasury stock, shares	8,408,770	8,408,770
Common Class A [Member]
Common Stock, par value per share	$ 1	$ 1
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares issued	39,111,722	39,098,792
Common Class B [Member]
Common Stock, par value per share	$ 1	$ 1
Common Stock, shares authorized	25,000,000	25,000,000
Common Stock, shares issued	1,617,998	1,617,998
Common Stock, shares outstanding	1,617,998	1,617,998