CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Preferred Stock, par value per share	$ 5.00	$ 5.00
Preferred Stock, shares authorized	2,000,000	2,000,000
Treasury stock, shares	8,408,770	8,418,620
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	39,095,992	37,450,329
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	3,233,998
Common Stock, shares outstanding	1,617,998	3,233,998