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Employee Postretirement Benefits - Summary of Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets $ 330,479 $ 313,797
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 328,961 310,094
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
NAV    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 1,518 3,703
Equity Funds    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 127,159 124,327
Equity Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 127,159 124,327
Equity Funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Equity Funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Equity Funds | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Fixed Income Funds    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 167,604 156,424
Fixed Income Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 167,604 156,424
Fixed Income Funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Fixed Income Funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Fixed Income Funds | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Hybrid Funds    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 10,980 9,756
Hybrid Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 10,980 9,756
Hybrid Funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Hybrid Funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Hybrid Funds | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
U.S. Treasury Securities    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 23,218 19,587
U.S. Treasury Securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 23,218 19,587
U.S. Treasury Securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
U.S. Treasury Securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
U.S. Treasury Securities | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
SEI Energy Debt Collective Fund    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 1,518 3,703
SEI Energy Debt Collective Fund | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
SEI Energy Debt Collective Fund | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
SEI Energy Debt Collective Fund | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
SEI Energy Debt Collective Fund | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets $ 1,518 $ 3,703