Capital Stock (Details) (USD $)				9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Second Cumulative Preferred Voting Stock	Sep. 30, 2014 Treasury Stock	Nov. 30, 2005 Board of Directors	Sep. 30, 2014 4 1/2% Cumulative Preferred Nonvoting Stock	Sep. 30, 2014 4 1/2% Cumulative Preferred Nonvoting Stock
Capital Unit [Line Items]
Preferred stock, shares authorized			1,000,000			100,000	100,000
Preferred stock, par value			$ 10			$ 50	$ 50
Percentage of cumulative preferred stock						4.50%	4.50%
Preferred stock, callable price per share						$ 52.50	$ 52.50
Preferred stock, shares issued			0			71,373	71,373
Treasury share, number of shares held						52,878	52,878
Purchase of treasury shares						$ 0	$ 0
Common Stock, Shares Authorized	180,000,000
Common stock, par value	$ 0	$ 0
Common stock, shares, outstanding	37,439,243	37,202,099
Common stock, shares, issued		303,668
Common stock, value, issued					$ 100,000,000
Treasury stock, shares	24,642,148	24,575,624
Reissued shares				39,711