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Retirement Benefit Plans (Fair Values of Pension Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Total Assets including Common Trust Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 787,001 $ 734,820
Level 1 [Member] | Total Assets including Common Trust Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 139,350 124,057
Level 2 [Member] | Total Assets including Common Trust Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 34,384 37,726
Pension Benefits [Member] | Cash And Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,732 6,357
Pension Benefits [Member] | Total Cash and Cash-Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,732 6,357
Pension Benefits [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 71,622 64,202
Pension Benefits [Member] | Exchange Traded Fund (ETF)-Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,834 4,133
Pension Benefits [Member] | Total Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 76,456 68,335
Pension Benefits [Member] | Domestic And Foreign Stock [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 50,646 48,279
Pension Benefits [Member] | Mutual Funds-Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 40,900 38,812
Pension Benefits [Member] | Total Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 91,546 87,091
Pension Benefits [Member] | Total Real Assets At Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 173,734 161,783
Pension Benefits [Member] | Collective Investment Trust Fund - Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 62,901  
Pension Benefits [Member] | Common Trust Fund (Fixed Income) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 483,491 514,562
Pension Benefits [Member] | Common Trust Fund (Real Assets) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 66,875 58,475
Pension Benefits [Member] | Level 1 [Member] | Cash And Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,732 6,357
Pension Benefits [Member] | Level 1 [Member] | Total Cash and Cash-Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,732 6,357
Pension Benefits [Member] | Level 1 [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 37,238 26,476
Pension Benefits [Member] | Level 1 [Member] | Exchange Traded Fund (ETF)-Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,834 4,133
Pension Benefits [Member] | Level 1 [Member] | Total Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 42,072 30,609
Pension Benefits [Member] | Level 1 [Member] | Domestic And Foreign Stock [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 50,646 48,279
Pension Benefits [Member] | Level 1 [Member] | Mutual Funds-Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 40,900 38,812
Pension Benefits [Member] | Level 1 [Member] | Total Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 91,546 87,091
Pension Benefits [Member] | Level 1 [Member] | Total Real Assets At Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 139,350 124,057
Pension Benefits [Member] | Level 2 [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 34,384 37,726
Pension Benefits [Member] | Level 2 [Member] | Total Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 34,384 37,726
Pension Benefits [Member] | Level 2 [Member] | Total Real Assets At Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 34,384 $ 37,726