Common Stock and Earnings per Share (Schedule of Common Stock Outstanding) (Details)	12 Months Ended
	Dec. 31, 2016 shares
Earnings Per Share [Abstract]
Shares outstanding at January 1	11,332,272
Issuance of common stock:
Employee restricted stock grants	15,455
Employee SARs exercised	20,761
Directors' compensation	9,029
Shares repurchased	(187,123)
Shares forfeited	(1,928)
Shares outstanding at December 31	11,188,466