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EMPLOYEE BENEFIT PLANS - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) pension_plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of qualified defined benefit plans | pension_plan | 1 |  |
Pension contribution requirements in next fiscal year | $ 0 |  |
Cost recognized | 1,100,000 | $ 1,000,000.0 | $ 900,000
Amount of employer and related party securities included in plan assets | 8,500,000 | 10,600,000 |
Contributions for 401k plan enhancement | $ 1,000,000.0 | $ 900,000 | $ 800,000
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase (decrease) in discount rate | (0.80%) |  |
Increase (decrease) to net losses from discount rate | $ (11,200,000) |  |
Increase (decrease) from demographic experience | (400,000) |  |
Recognized (loss) from return on plan assest | 9,300,000 |  |
Recognized (loss) from mortality rate | $ 700,000 |  |
Discount rate | 2.26% | 3.06% | 4.11%
Expected long-term return on plan assets | 5.72% | 5.72% | 7.17%
Percentage of Plan Assets | 100.00% | 100.00% |
Pension Benefits | Maximum | Defined Benefit Plan, Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 80.00% |  |
Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase (decrease) in discount rate | (0.74%) |  |
Increase (decrease) to net losses from discount rate | $ (200,000) |  |
Discount rate | 2.42% | 3.16% | 4.18%
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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