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Pension Plan and Other Postretirement Benefits - Pension Fund Assets Measured at Fair Value (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 360,678 $ 329,781 $ 269,783
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 351,458 320,241  
Level 1 | Global MGD Volatility Fund (mixed equities fund)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 69,607 67,184  
Level 1 | Large Capitalization Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 42,697 37,357  
Level 1 | International Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 35,607 30,653  
Level 1 | Small and Mid-Capitalization Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 16,111 13,447  
Level 1 | SEI Dynamic Asset Allocation Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 11,729 10,168  
Level 1 | Emerging Markets Equity Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 16,146 13,792  
Level 1 | Fixed Income Securities Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 159,192 147,639  
Level 1 | Cash Management – Money Market Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 369 $ 1