Capital Stock (Details) (USD $)			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 4 1/2% Cumulative Preferred Nonvoting Stock	Mar. 31, 2014 Second Cumulative Preferred Voting Stock	Nov. 30, 2005 Board of Directors
Capital Unit [Line Items]
Preferred stock, shares authorized			100,000	1,000,000
Preferred stock, par value			$ 50	$ 10
Percentage of cumulative preferred stock			4.50%
Preferred stock, callable price per share			$ 52.50
Preferred stock, shares issued			71,373	0
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	37,347,653	37,202,099
Common stock, shares, issued	64,642	303,668
Common stock, value, issued					$ 100,000,000
Treasury stock, shares	24,669,096	24,575,624