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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
Numerator:
Net income	$ 7,957	$ 5,145	$ 20,436	$ 7,575
Denominator:
Weighted average common shares outstanding	16,492	16,314	16,423	16,263
Weighted average dilutive securities	138	160	157	213
Weighted average common shares outstanding, diluted	16,630	16,474	16,580	16,476
Income per common share: Basic	$ 0.48	$ 0.32	$ 1.24	$ 0.47
Income per common share: Diluted	$ 0.48	$ 0.31	$ 1.23	$ 0.46

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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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