EQUITY AND EPS - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	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, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.48	$ 0.40	$ 0.32
Dividends paid (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.48	$ 0.40	$ 0.32
Dividend payment	$ 2,030	$ 2,029	$ 2,027	$ 2,047	$ 1,703	$ 1,703	$ 1,702	$ 1,701	$ 1,349	$ 1,348	$ 1,348	$ 1,348	$ 8,133	$ 6,809	$ 5,393
Dividend equivalent payment	14	14	14	13	12	11	11	13	26	27	27	27	55	47	107
Total payment	$ 2,044	$ 2,043	$ 2,041	$ 2,060	$ 1,715	$ 1,714	$ 1,713	$ 1,714	$ 1,375	$ 1,375	$ 1,375	$ 1,375	$ 8,188	$ 6,856	$ 5,500

Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in stock.

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