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CASH FLOW INFORMATION - Stock-Based Compensation (Details) - 2015 EIP Plan - USD ($) $ / shares in Units, $ in Thousands							12 Months Ended
	Jul. 15, 2020	Feb. 25, 2020	May 15, 2019	Mar. 04, 2019	May 15, 2018	Feb. 27, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units
Non-cash investing and financing activities
Granted (in shares)	42,642	173,749	29,580	106,079	14,268	37,436	221,903	140,914	51,704
Aggregate fair value	$ 255	$ 1,227	$ 255	$ 890	$ 255	$ 512
Vested (in shares)	29,580		14,268				83,675	127,988	122,663
Stock Options
Non-cash investing and financing activities
Options to purchase (in shares)		344,568		240,540		122,608	344,568	240,540	122,608
Exercise price		$ 7.06		$ 8.065		$ 13.365	$ 7.06	$ 8.33	$ 13.69
Aggregate fair value		$ 693		$ 904		$ 926

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- Definition

Represents the aggregate fair value of grants made during the period on other than stock (or unit) option plans.

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Represents the total fair value of options granted during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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