Capitalization Narrative (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Common stock, shares authorized	36,000,000	36,000,000
Common stock, par value	$ 0.521	$ 0.521
Common stock, shares issued	18,670,566	18,592,827
Common stock, shares outstanding	18,670,566	18,592,827
Preferred stock, shares authorized	176,407	176,407
Preferred stock, par value	$ 25	$ 25
Preferred stock, shares outstanding	0	0