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Benefit Plans - Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 331,943 $ 297,603  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 264,974 231,996  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 66,969 65,607  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 212,180 183,509  
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 212,180 183,509  
Equity securities | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14,186 12,475  
Cash and equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14,186 12,475  
Cash and equivalents | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 105,577 101,619  
Fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38,608 36,012  
Fixed income | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 66,969 65,607  
Fixed income | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 310,176 278,124 $ 243,521
Pension Plan | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 100,036 $ 95,935  
Actual plan asset allocations as a percent of total plan assets 32.00% 35.00%  
Pension Plan | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 197,248 $ 170,747  
Actual plan asset allocations as a percent of total plan assets 64.00% 61.00%  
Pension Plan | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 12,892 $ 11,442  
Actual plan asset allocations as a percent of total plan assets 4.00% 4.00%  
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 21,767 $ 19,479 $ 17,226
Other Postretirement Benefits Plan | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5,541 $ 5,684  
Actual plan asset allocations as a percent of total plan assets 25.00% 29.00%  
Other Postretirement Benefits Plan | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 14,932 $ 12,762  
Actual plan asset allocations as a percent of total plan assets 69.00% 66.00%  
Other Postretirement Benefits Plan | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,294 $ 1,033  
Actual plan asset allocations as a percent of total plan assets 6.00% 5.00%