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EARNINGS PER SHARE - Calculation of Basic and Diluted Earnings per Share(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 3,625	$ 2,002
Weighted average shares outstanding - basic (in shares)	8,082	8,060
Dilutive effect of share-based compensation (in shares)	186	138
Weighted average shares outstanding - diluted (in shares)	8,268	8,198
Per share information:
Basic earnings per share (in usd per share)	$ 0.45	$ 0.25
Diluted earnings per share (in usd per share)	$ 0.44	$ 0.24

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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