Capital Stock (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Second Cumulative Preferred Voting Stock [Member]	Dec. 31, 2011 4 1/2% Cumulative Preferred Nonvoting Stock [Member]
Class of Stock [Line Items]
Common stock, no par value
Common stock, shares authorized	180,000,000
Preferred stock, par value	$ 50	$ 50	$ 10	$ 50
Preferred stock, shares authorized			1,000,000	100,000
Preferred stock, dividend percentage				4.50%
Preferred stock, shares issued			0	71,373
Treasury share, number of shares held				52,878
Treasury stock value	$ 266,231	$ 265,606		$ 1,800