Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Statement of Financial Position [Abstract]
Common stock, par value per share	$ 0.1	$ 0.1	$ 0.1
Common stock, shares authorized	80,000,000	80,000,000	80,000,000
Common stock, shares issued	30,235,164	30,235,164	30,235,164
Treasury shares, at cost	1,379,345	2,224,902	2,164,873