Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Consolidated Balance Sheets
Common stock, Par value (in dollars per share)	$ 1	$ 1
Common Stock, Shares authorized	60,000,000	60,000,000
Common stock, Shares issued	34,534,234	34,427,234
Common stock, Shares outstanding	29,556,216	29,483,429
Treasury stock, Shares	4,978,018	4,943,805