Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, Authorized shares	5,000,000	5,000,000
Preferred stock, unissued shares	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, Authorized shares	200,000,000	200,000,000
Common stock, shares issued	78,661,248	78,661,248
Common stock, shares outstanding	64,257,182	64,051,600
Treasury, shares	14,178,801	14,383,241