Net Income per Share of Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator for earnings per share:
Net income that is available to common shareholders	$ 10,073	$ 66,333	$ 4,963
Denominator for basic earnings per share:
Weighted average shares outstanding	21,879,613	21,816,935	21,716,288
Denominator for diluted earnings per share:
Effect of stock options and restricted stock units	169,330	342,214	467,249
Adjusted weighted average shares and assumed conversions	22,048,943	22,159,149	22,183,537
Basic earnings per share	$ 0.46	$ 3.04	$ 0.23
Diluted earnings per share	$ 0.46	$ 2.99	$ 0.22
Antidilutive Securities, Excluded From Calculation [Member]
Shares excluded from diluted earnings per share due to:
Inclusion would have been anti-dilutive (excluded from calculation)	602,402	105,201	168,557

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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