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Benefit Plans - Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 297,603 $ 260,747  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 231,996 192,752  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 65,607 67,995  
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 183,509 157,050  
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 183,509 149,265  
Equity securities | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 7,785  
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 12,475 11,801  
Cash and equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12,475 11,801  
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 101,619 91,896  
Fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 36,012 31,686  
Fixed income | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 65,607 60,210  
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 278,124 243,521 $ 127,610
Pension Plan | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 95,935 $ 86,288  
Actual plan asset allocations as a percent of total plan assets 35.00% 36.00%  
Pension Plan | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 170,747 $ 146,210  
Actual plan asset allocations as a percent of total plan assets 61.00% 60.00%  
Pension Plan | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 11,442 $ 11,023  
Actual plan asset allocations as a percent of total plan assets 4.00% 5.00%  
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 19,479 $ 17,226 $ 5,849
Other Postretirement Benefits Plan | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5,684 $ 5,608  
Actual plan asset allocations as a percent of total plan assets 29.00% 33.00%  
Other Postretirement Benefits Plan | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 12,762 $ 10,840  
Actual plan asset allocations as a percent of total plan assets 66.00% 63.00%  
Other Postretirement Benefits Plan | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,033 $ 778  
Actual plan asset allocations as a percent of total plan assets 5.00% 5.00%