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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of Shares |  |  |
Outstanding at beginning of year (in shares) | 1,559,012 | 1,559,012 | 1,559,012
Outstanding at end of year (in shares) | 1,559,012 | 1,559,012 | 1,559,012
Exercisable at end of year (in shares) | 1,559,012 | 1,559,012 | 1,559,012
Weighted-Average Exercise Price per Share |  |  |
Outstanding at beginning of year (in dollars per share) | $ 11.60 | $ 11.60 | $ 11.60
Outstanding at end of year (in dollars per share) | 11.60 | 11.60 | 11.60
Exercisable at end of year (in dollars per share) | $ 11.60 | $ 11.60 | $ 11.60

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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(1)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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