Net Income (Loss) per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator for earnings per share:
Net income (loss) that is available to common shareholders	$ 3,988	$ (832)	$ 1,027	$ (7,402)
Denominator for basic earnings per share:
Weighted average shares outstanding	22,170,338	22,029,519	22,130,503	21,984,365
Denominator for diluted earnings per share:
Effect of stock options and restricted stock units	185,550	0	36,584	0
Adjusted weighted average shares and assumed conversions	22,355,888	22,029,519	22,167,087	21,984,365
Basic earnings (loss) per share	$ 0.18	$ (0.04)	$ 0.05	$ (0.34)
Diluted earnings (loss) per share	$ 0.18	$ (0.04)	$ 0.05	$ (0.34)
Net loss position (excluded from denominator)
Shares excluded from diluted earnings (loss) per share due to:
Shares excluded from diluted earnings (loss) per share due to:	0	60,141	0	111,791
Inclusion would have been anti-dilutive (excluded from calculation)
Shares excluded from diluted earnings (loss) per share due to:
Shares excluded from diluted earnings (loss) per share due to:	752,375	924,652	982,386	744,317

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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