Earnings (Loss) Per Share - Computation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 3,300	$ 409	$ 6,879	$ (7,325)
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Denominator for basic earnings (loss) per share – weighted average shares	8,223	8,027	8,170	8,029
Effect of dilutive securities:
Employee restricted stock	17	12	23	0
Denominator for diluted earnings (loss) per share – adjusted weighted average shares and assumed conversion	8,240	8,039	8,193	8,029
Basic earnings (loss) per share (in usd per share)	$ 0.40	$ 0.05	$ 0.84	$ (0.91)
Diluted earnings (loss) per share (in usd per shares)	$ 0.40	$ 0.05	$ 0.84	$ (0.91)
Weighted average anti-dilutive employee restricted stock	106	0	72	2