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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Assets within Defined Benefit Pension Plans Invested) (Details) - Pension Plans [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value of Plan Assets $ 325,790 $ 398,468 $ 351,285
Cash and Cash Equivalents [Member]      
Fair Value of Plan Assets 5,571 6,671  
Global Equity Securities [Member]      
Fair Value of Plan Assets [1] 104,775 127,688  
Fixed Income Securities [Member]      
Fair Value of Plan Assets [2] 172,909 214,018  
Alternative Securities [Member]      
Fair Value of Plan Assets [3] 42,535 50,091  
Level 1 [Member]      
Fair Value of Plan Assets 296,296 357,914  
Level 1 [Member] | Cash and Cash Equivalents [Member]      
Fair Value of Plan Assets 5,571 6,671  
Level 1 [Member] | Global Equity Securities [Member]      
Fair Value of Plan Assets [1] 104,775 127,688  
Level 1 [Member] | Fixed Income Securities [Member]      
Fair Value of Plan Assets [2] 143,415 173,464  
Level 1 [Member] | Alternative Securities [Member]      
Fair Value of Plan Assets [3] 42,535 50,091  
Level 2 [Member]      
Fair Value of Plan Assets 29,494 40,554  
Level 2 [Member] | Fixed Income Securities [Member]      
Fair Value of Plan Assets [2] $ 29,494 $ 40,554  
[1] Level 1 assets are international and domestic managed investments that track the MSCI All-Country World Index.
[2] Level 1 assets are investments in a diversified portfolio of fixed income instruments of varying maturities representing corporates, U.S. treasuries, municipals and futures. Level 2 assets are thinly traded investments in a diversified portfolio of fixed income instruments of varying maturities representing mostly corporates securities.  Both Level 1 & Level 2 investments track the Bloomberg Barclay’s Long-term Credit Index.
[3] Level 1 assets are long-term investment funds which are invested in tangible assets and real asset companies such as, infrastructure, natural resources and timber.