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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per Share - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net income (loss)	$ (3,913)	$ 4,820	$ 6,981
Weighted average shares outstanding-Diluted	35,556	36,319	36,176
Net income (loss) per share Diluted	$ (0.11)	$ 0.13	$ 0.19

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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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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