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EARNINGS PER COMMON SHARE - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator for basic and diluted earnings per share:
Net income	$ 4,878	$ 5,097	$ 4,558	$ 4,011	$ 183	$ 10,182	$ 4,546	$ 6,653	$ 18,544	$ 21,564	$ 24,249
Less net income attributable to non-controlling interests									(533)	(899)	(102)
Less earnings allocated to unvested restricted stock									(1,227)	(1,173)	(1,072)
Net income available for common stockholders: basic and diluted									$ 16,784	$ 19,492	$ 23,075
Denominator for basic earnings per share:
Weighted average number of common shares	19,245	19,191	19,023	18,894	18,733	18,646	18,519	18,396	19,090	18,575	17,944
Effect of diluted securities:
RSUs									29	13	103
Denominator for diluted earnings per share:
Weighted average number of shares	19,266	19,239	19,129	18,993	18,748	18,705	18,593	18,434	19,119	18,588	18,047
Earnings per common share, basic (in dollars per share)	$ 0.23	$ 0.25	$ 0.20	$ 0.19	$ (0.01)	$ 0.53	$ 0.23	$ 0.30	$ 0.88	$ 1.05	$ 1.29
Earnings per common share, diluted (in dollars per share)	$ 0.23	$ 0.25	$ 0.20	$ 0.19	$ (0.01)	$ 0.52	$ 0.23	$ 0.30	$ 0.88	$ 1.05	$ 1.28

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