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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Employee benefit plans |  |  |
Maximum participants' contribution as a percentage of pre-tax compensation | 20.00% |  |
Employer matching contribution and percent of match | 75.00% |  |
Company contributions | $ 7,100,000 | $ 7,400,000 | $ 6,500,000
Recorded value of noncurrent investments | $ 59,000,000 | 63,900,000 |
Other postretirement plan | Other Postretirement PlanThe Company provides substantially all active, permanent employees with medical, dental, and vision benefits through a self-insured plan. Employees retiring at or after age 58, along with their spouses and dependents, continue participation in the plan by payment of a premium. Plan assets are invested in mutual funds, short-term money market instruments and commercial paper based upon a similar asset mix to the pension plan. Retired employees are also provided with a $10,000 dollar life insurance benefit.The Company records the costs of postretirement benefits other than pensions (PBOP) during the employees' years of active service. Postretirement benefit expense recorded in 2022, 2021, and 2020, was $0.1 million, $0.2 million, and $5.2 million, respectively. The remaining net periodic benefit cost was $0.2 million at December 31, 2022, and is being recovered through future customer rates and is recorded as a regulatory asset. |  |
Annual rate of increase in the per capita cost | 5.30% |  |
Health care cost trend rate assumed, year three | 5.20% |  |
Health care cost trend rate, net periodic benefit cost | 3.90% |  |
Domestic Equity: Large Cap Stocks |  |  |
Employee benefit plans |  |  |
Index percentage | 35.00% |  |
Domestic Equity: Small/Mid Cap Stocks |  |  |
Employee benefit plans |  |  |
Index percentage | 15.00% |  |
Non U.S. Equities |  |  |
Employee benefit plans |  |  |
Index percentage | 10.00% |  |
Long-term rate of return on plan assets | 9.20% |  |
Fixed Income Securities |  |  |
Employee benefit plans |  |  |
Index percentage | 40.00% |  |
Fixed Income |  |  |
Employee benefit plans |  |  |
Assumed percentage of portfolio investment | 40.00% |  |
Assumed long-term inflation rate | 2.25% |  |
Equity Securities |  |  |
Employee benefit plans |  |  |
Assumed percentage of portfolio investment | 60.00% |  |
Assumed long-term inflation rate | 2.25% |  |
Minimum | Fixed Income |  |  |
Employee benefit plans |  |  |
Maturity period | 1 year |  |
Maximum |  |  |
Employee benefit plans |  |  |
Employer matching contribution and percent of match | 6.00% |  |
Maximum | Fixed Income |  |  |
Employee benefit plans |  |  |
Maturity period | 5 years |  |
Pension Benefits |  |  |
Employee benefit plans |  |  |
Accumulated benefit obligations | $ 505,900,000 | 650,200,000 |
Fair value of pension plan assets | 637,330,000 | 810,469,000 | 716,794,000
Net periodic benefit cost | $ 20,996,000 | $ 27,253,000 | 45,684,000
Long-term rate of return on plan assets | 7.50% | 6.34% |
Estimated annual contributions in next fiscal year | $ 2,900,000 |  |
Pension Benefits | Fixed Income |  |  |
Employee benefit plans |  |  |
Assumed returns | 5.18% |  |
Pension Benefits | Fixed Income | Level 1 | Money Market Fund Investments |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | $ 600,000 | $ 11,000,000 |
Pension Benefits | Total Domestic Equity: |  |  |
Employee benefit plans |  |  |
Assumed long-term inflation rate | 8.35% |  |
SERP |  |  |
Employee benefit plans |  |  |
Accumulated benefit obligations | $ 69,300,000 | 80,500,000 |
Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 144,686,000 | 169,436,000 | 147,057,000
Life insurance benefit | 10,000 |  |
Net periodic benefit cost | 88,000 | $ 227,000 | $ 5,211,000
Net periodic benefit cost | $ 200,000 |  |
Long-term rate of return on plan assets | 7.36% | 5.88% |
Estimated annual contributions in next fiscal year | $ 200,000 |  |
Other Benefits | Fixed Income | Level 1 | Money Market Fund Investments |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | $ 0 | $ 3,000,000 |
Other Benefits | Short-term cash investments |  |  |
Employee benefit plans |  |  |
Assumed returns | 4.95% |  |

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- Definition Description of investment policy and strategy for defined benefit plan asset. Includes, but is not limited to, investment allocation decision and factor pertinent to understanding investment policy and strategy for plan asset. Factor includes, but is not limited to, investment goal, risk management practice, permitted and prohibited investment including use of derivative, diversification, and relationship between plan asset and obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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