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Retirement Plans (Quantitative Disclosures of Retirement Income Plan's Invested Assets that are Measured at Fair Value on a Recurring Basis) (Details) - Retirement Income Plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Total Assets $ 342,974 $ 450,305 $ 432,716
Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 341,826 456,502  
Total Equities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 241,987 300,389  
Return Seeking Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 242,345 300,849  
Liability Hedging Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 91,633 151,487  
Cash And Short Term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 7,848 4,166  
Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 358 460  
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 338,728 453,620  
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Total Equities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 241,987 300,389  
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Return Seeking Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 241,987 300,389  
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Liability Hedging Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 91,633 151,487  
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Cash And Short Term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 5,108 1,744  
Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,740 2,422  
Significant Other Observable Inputs (Level 2) [Member] | Total Equities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Significant Other Observable Inputs (Level 2) [Member] | Return Seeking Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Significant Other Observable Inputs (Level 2) [Member] | Liability Hedging Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Significant Other Observable Inputs (Level 2) [Member] | Cash And Short Term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,740 2,422  
Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Significant Unobservable Inputs (Level 3) [Member] | Total Equities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Significant Unobservable Inputs (Level 3) [Member] | Return Seeking Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Significant Unobservable Inputs (Level 3) [Member] | Liability Hedging Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Significant Unobservable Inputs (Level 3) [Member] | Cash And Short Term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Global Equity [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 63,852 144,634  
Global Equity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 63,852 144,634  
Global Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Global Equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Diversified Credit [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 58,761 66,165  
Diversified Credit [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 58,761 66,165  
Diversified Credit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Diversified Credit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Real Assets Equity [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 95,396 89,590  
Real Assets Equity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 95,396 89,590  
Real Assets Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Real Assets Equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Liquid diversifiers | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [2] 23,978    
Liquid diversifiers | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [2] 23,978    
Liquid diversifiers | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [2] 0    
Liquid diversifiers | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [2] 0    
Real Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 27 47  
Real Assets [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Real Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Real Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Equity Funds [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 331 413  
Private Equity Funds [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Equity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Alternative Investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Alternative Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Alternative Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Fixed Income Securities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 35,378 86,183  
Fixed Income Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 35,378 86,183  
Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Fixed Income Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
US Treasury Securities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 56,255 65,304  
US Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 56,255 65,304  
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
US Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Short-term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 5,108 1,744  
Short-term Investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 5,108 1,744  
Short-term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Short-term Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Deposit Administration Contracts [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,740 2,422  
Deposit Administration Contracts [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Deposit Administration Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,740 2,422  
Deposit Administration Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets $ 0 $ 0  
[1] In accordance with the FASB issued ASU 2015-07, Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent), certain investments that are measured at fair value using the net asset value per share (or its practical expedient) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total Pension Plan invested assets.
[2] Liquid diversifiers are investments that unbundle return drivers from hedge funds, providing investors access to liquid, diversifying returns.