Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.5	$ 0.5
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	178,462,611	177,928,922
Treasury stock, shares	1,763,171	1,178,323