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Capitalization Narrative (Details) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]    
Common stock, shares authorized 36,000,000 36,000,000
Common stock, par value (usd per share) $ 0.521 $ 0.521
Common stock, shares issued 20,381,949 20,286,840
Common stock, shares outstanding 20,381,949 20,286,840
Preferred stock, shares authorized 176,407 176,407
Preferred stock, par value (usd per share) $ 25 $ 25
Preferred stock, shares outstanding 0 0
Preferred stock, shares issued 0 0