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Earnings Per Share - Calculation of Earnings 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
BASIC
Net income	$ 959	$ 1,728	$ 23,031	$ 6,531
Weighted-average common shares outstanding (in shares)	13,836	14,381	13,997	14,412
Basic earnings per share (in dollars per share)	$ 0.07	$ 0.12	$ 1.65	$ 0.45
DILUTED
Net income	$ 959	$ 1,728	$ 23,031	$ 6,531
Weighted-average common shares outstanding (in shares)	13,836	14,381	13,997	14,412
Dilutive effect of stock options, restricted stock and common stock warrants (in shares)	123	285	119	277
Weighted-average common shares outstanding on a diluted basis (in shares)	13,959	14,666	14,116	14,689
Diluted earnings per share (in dollars per share)	$ 0.07	$ 0.12	$ 1.63	$ 0.44

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- Definition

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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