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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Total Assets $ 345,132 $ 342,974 $ 450,305
Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 347,940 341,826  
Total Equities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 181,366 241,987  
Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 338 358  
Return Seeking Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 181,704 242,345  
Liability Hedging Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 154,830 91,633  
Cash And Short Term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 11,406 7,848  
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 345,211 338,728  
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 181,366 241,987  
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 181,366 241,987  
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 154,830 91,633  
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 9,015 5,108  
Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,391 2,740  
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 2,391 2,740  
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 39,038 63,852  
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 39,038 63,852  
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 42,630 58,761  
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 42,630 58,761  
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 59,603 95,396  
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 59,603 95,396  
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 40,095 [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 40,095 [2] 23,978  
Liquid diversifiers | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 [2] 0  
Liquid diversifiers | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 [2] 0  
Real Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 27 27  
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] 311 331  
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 79,632 35,378  
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 79,632 35,378  
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 75,198 56,255  
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 75,198 56,255  
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 9,015 5,108  
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 9,015 5,108  
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 2,391 2,740  
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 2,391 2,740  
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] These investments were measured at fair value using the net asset value per share (or its practical expedient) and 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.