Earning Per Common Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for basic and diluted earnings per common share:
Net income	$ 3,064	$ 6,408	$ 16,318	$ 9,984
Denominator:
Weighted average shares outstanding (shares)	10,420	10,365	10,406	10,361
Denominator for basic earnings per common share (shares)	10,420	10,365	10,406	10,361
Effect of dilutive securities:
Other stock compensation plans (shares)	254	124	225	120
Dilutive potential common shares (shares)	254	124	225	120
Denominator for diluted earnings (loss) per common share - adjusted weighted average shares outstanding (shares)	10,674	10,489	10,631	10,481
Basic earnings per common share (usd per share)	$ 0.29	$ 0.62	$ 1.57	$ 0.96
Diluted earnings per common share (usd per share)	$ 0.29	$ 0.61	$ 1.53	$ 0.95

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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