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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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