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BENEFIT PLANS: Information about Plan Assets, Fair Value of Plan Assets by Measurement (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | $ 917,513 |  | $ 839,728 |  | $ 984,464
Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 31,804 | [1] | 28,565 | [1] | $ 41,464
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 28,830 |  | 11,679 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Intermediate Bonds |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 218,027 |  | 199,835 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Large Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 93,879 |  | 85,617 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Mid Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 105,700 |  | 90,049 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Small Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 75,596 |  | 65,505 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Micro-Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 37,759 |  | 33,438 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: International |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 58,401 |  | 52,876 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 7,850 |  | 6,964 |  |
Fair Value, Inputs, Level 1 | Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 443,762 |  | 379,433 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 28,830 |  | 11,679 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Intermediate Bonds |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 35,747 |  | 33,305 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Large Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 93,879 |  | 85,617 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Mid Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 105,700 |  | 90,049 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Small Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 75,596 |  | 65,505 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Micro-Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 37,759 |  | 33,438 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: International |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 58,401 |  | 52,876 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 7,850 |  | 6,964 |  |
Fair Value, Inputs, Level 1 | Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets | [1] | 1,726 |  | 2,009 |  |
Fair Value, Inputs, Level 2 | Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 182,280 |  | 166,530 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Intermediate Bonds |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 182,280 |  | 166,530 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Equity Securities: Large Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Equity Securities: Mid Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Equity Securities: Small Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Equity Securities: Micro-Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Equity Securities: International |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Pension Plan | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets | [1] | 30,078 |  | 26,556 |  |
Fair Value, Inputs, Level 3 | Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Intermediate Bonds |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Equity Securities: Large Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Equity Securities: Mid Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Equity Securities: Small Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Equity Securities: Micro-Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Equity Securities: International |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Pension Plan | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 | Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets | [1] | 0 |  | 0 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Equity Securities: International |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 131,921 |  | 117,631 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Equity Securities: Emerging Markets |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 40,398 |  | 42,119 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Real Estate |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 74,426 |  | 83,676 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Private market investments |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 41,756 |  | $ 50,339 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Direct Lending Fund: Fixed Income |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | $ 2,970 |  |  |  |
[1] | The postretirement benefits assets are primarily life insurance contracts.

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