Capital Stock (Details) (USD $)				6 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Second Cumulative Preferred Voting Stock	Jun. 30, 2014 Treasury Stock	Nov. 30, 2005 Board of Directors	Jun. 30, 2014 4 1/2% Cumulative Preferred Nonvoting Stock
Capital Unit [Line Items]
Preferred stock, shares authorized			1,000,000			100,000
Preferred stock, par value			$ 10			$ 50
Percentage of cumulative preferred stock						4.50%
Preferred stock, callable price per share						$ 52.50
Preferred stock, shares issued			0			71,373
Treasury share, number of shares held						52,878
Purchase of treasury shares						$ 0
Common Stock, Shares Authorized	180,000,000
Common stock, par value	$ 0	$ 0
Common stock, shares, outstanding	37,384,962	37,202,099
Common stock, shares, issued	39,064	303,668
Common stock, value, issued					$ 100,000,000
Treasury stock, shares	24,657,365	24,575,624
Reissued shares				15,994