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Employee Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets $ 313,798 $ 387,212
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 310,095 374,415
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 3,703 12,797
Equity Funds    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 124,327 149,479
Equity Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 124,327 149,479
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 156,424 184,987
Fixed Income Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 156,424 184,987
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 9,756 11,776
Hybrid Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 9,756 11,776
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 19,588 28,173
U.S. Treasury Securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 19,588 28,173
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 3,703 12,797
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 $ 3,703 $ 12,797