INCENTIVE STOCK PLANS - Summary of Restricted Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	0	87,924	97,643
Weighted average price of restricted shares granted (in dollars per share)	$ 0	$ 35.44	$ 28.18
Intrinsic value of restricted stock outstanding	$ 5,540	$ 8,792	$ 8,906
Grant date fair value of restricted stock vested	4,579	1,582	1,198
Cash used to purchase common shares from current and former employees to pay minimum withholding tax requirements on restricted shares vested	$ 1,610	$ 334	$ 176
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	128,226	0	0
Weighted average price of restricted shares granted (in dollars per share)	$ 31.39	$ 0	$ 0
Intrinsic value of restricted stock outstanding	$ 3,351	$ 0	$ 0
Grant date fair value of restricted stock vested	762	0	0
Cash used to purchase common shares from current and former employees to pay minimum withholding tax requirements on restricted shares vested	$ 1	$ 0	$ 0

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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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).

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-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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