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Postretirement Benefit Obligations - Fair Value Measurement of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]        
Total Pension Plan Assets at Fair Value $ 89,039 $ 86,084 $ 77,362 $ 71,252
Emerging Markets Region Equities        
Defined Benefit Plan Disclosure [Line Items]        
Total Pension Plan Assets at Fair Value 5,184 4,839 4,427  
International Region Equities        
Defined Benefit Plan Disclosure [Line Items]        
Total Pension Plan Assets at Fair Value 17,618 16,975 14,370  
United States Equities        
Defined Benefit Plan Disclosure [Line Items]        
Total Pension Plan Assets at Fair Value 41,235 38,324 31,235  
United States Bonds        
Defined Benefit Plan Disclosure [Line Items]        
Total Pension Plan Assets at Fair Value 22,034 22,988 20,115  
Real Estate        
Defined Benefit Plan Disclosure [Line Items]        
Total Pension Plan Assets at Fair Value 1,360 1,391 1,563  
Cash Fund        
Defined Benefit Plan Disclosure [Line Items]        
Total Pension Plan Assets at Fair Value $ 1,608 $ 1,567 $ 5,652