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SHARE BASED COMPENSATION, 401(K) PLAN AND DEFERRED COMPENSATION - Restricted Performance Share Units (Details) - Restricted Performance Share Units Plan - Executive Officers - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 21, 2020 | Feb. 21, 2019 | Feb. 28, 2018 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance (in shares) |  |  |  | 396,365
Granted (in shares) |  |  |  | 319,600
Ending balance (in shares) |  |  |  | 715,965
February 28, 2018 RSPU Grant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance (in shares) |  |  |  | 190,296
Granted (in shares) |  |  |  | 0
Ending balance (in shares) |  |  |  | 190,296
Total number of shares authorized for issuance (in shares) |  |  | 209,193 |
Fair Value of Units on Grant Date |  |  | $ 4,276 |
February 21, 2019 RSPU Grant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance (in shares) |  |  |  | 206,069
Granted (in shares) |  |  |  | 0
Ending balance (in shares) |  |  |  | 206,069
Total number of shares authorized for issuance (in shares) |  | 213,728 |  |
Fair Value of Units on Grant Date |  | $ 4,627 |  |
March 5, 2020 RSPU Grant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance (in shares) |  |  |  | 0
Granted (in shares) |  |  |  | 319,600
Ending balance (in shares) |  |  |  | 319,600
Total number of shares authorized for issuance (in shares) | 319,600 |  |  |
Fair Value of Units on Grant Date | $ 5,389 |  |  |

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- Definition 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=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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