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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - $ / shares | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Shares |  |  |  |  |
Outstanding at beginning of year (in shares) | 1,559,012 | 1,559,012 | 1,559,012 |  |
Exercised (in shares) | 0 | 0 | (1,559,012) |  |
Outstanding at end of year (in shares) |  |  | 0 |  |
Exercisable at end of year (in shares) |  |  | 0 | 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 |  |
Exercised (in dollars per share) | $ 0 | $ 0 | 11.60 |  |
Outstanding at end of year (in dollars per share) |  |  | 0 |  |
Exercisable at end of year (in dollars per share) |  |  | $ 0 | $ 11.60 | $ 11.60

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- Definition Number of non-option equity instruments exercised by participants. + 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)(iv)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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