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BENEFIT PLANS: Information about Plan Assets, Fair Value of Plan Assets by Measurement (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | $ 1,023,375 |  | $ 951,142 |  | $ 917,513
Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 31,531 | [1] | 31,128 | [1] | $ 31,804
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 11,625 |  | 24,946 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Intermediate Bonds |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 246,455 |  | 224,705 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Large Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 54,168 |  | 49,848 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Mid Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 106,437 |  | 103,117 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Small Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 85,047 |  | 82,932 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: Micro-Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 43,752 |  | 38,871 |  |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Equity Securities: International |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 63,998 |  | 58,767 |  |
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 |  | 3,433 |  | 6,093 |  |
Fair Value, Inputs, Level 1 | Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 410,786 |  | 404,751 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 11,625 |  | 24,946 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Intermediate Bonds |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 42,326 |  | 40,177 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Large Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 54,168 |  | 49,848 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Mid Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 106,437 |  | 103,117 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Small Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 85,047 |  | 82,932 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: Micro-Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 43,752 |  | 38,871 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Equity Securities: International |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 63,998 |  | 58,767 |  |
Fair Value, Inputs, Level 1 | Pension Plan | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 3,433 |  | 6,093 |  |
Fair Value, Inputs, Level 1 | Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets | [1] | 1,224 |  | 3,054 |  |
Fair Value, Inputs, Level 2 | Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 204,129 |  | 184,528 |  |
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 |  | 204,129 |  | 184,528 |  |
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] | 30,307 |  | 28,074 |  |
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 |  | 146,047 |  | 124,559 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Equity Securities: Emerging Markets |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 52,305 |  | 41,590 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Real Estate |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 77,141 |  | 72,913 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Private market investments |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | 71,760 |  | 62,976 |  |
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 |  | 8,377 |  | 5,479 |  |
Fair Value Measured at Net Asset Value Per Share | Pension Plan | Comingled Fund: Equity Securities:Large-Cap |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | $ 52,830 |  | $ 54,346 |  |
[1] | The postretirement benefits assets are primarily life insurance contracts.

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