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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Fair Value Measurements) (Details) - Pension Plans [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value of Plan Assets $ 398,468 $ 351,285 $ 313,862
Cash and Cash Equivalents [Member]      
Fair Value of Plan Assets 6,671 4,120  
Global Equity Securities [Member]      
Fair Value of Plan Assets [1] 127,688    
Fixed Income Securities [Member]      
Fair Value of Plan Assets [2] 214,018 204,072  
Alternative Securities [Member]      
Fair Value of Plan Assets [3] 50,091 38,412  
Domestic Equity Securities [Member]      
Fair Value of Plan Assets [4]   54,699  
International Equity Securities [Member]      
Fair Value of Plan Assets [5]   21,848  
Emerging Markets [Member]      
Fair Value of Plan Assets [6]   28,134  
Level 1 [Member]      
Fair Value of Plan Assets 357,914 246,416  
Level 1 [Member] | Cash and Cash Equivalents [Member]      
Fair Value of Plan Assets 6,671 4,120  
Level 1 [Member] | Global Equity Securities [Member]      
Fair Value of Plan Assets [1] 127,688    
Level 1 [Member] | Fixed Income Securities [Member]      
Fair Value of Plan Assets [2] 173,464 204,072  
Level 1 [Member] | Alternative Securities [Member]      
Fair Value of Plan Assets [3] 50,091    
Level 1 [Member] | Domestic Equity Securities [Member]      
Fair Value of Plan Assets [4]   31,315  
Level 1 [Member] | Emerging Markets [Member]      
Fair Value of Plan Assets [6]   6,909  
Level 2 [Member]      
Fair Value of Plan Assets 40,554 104,869  
Level 2 [Member] | Fixed Income Securities [Member]      
Fair Value of Plan Assets [2] $ 40,554    
Level 2 [Member] | Alternative Securities [Member]      
Fair Value of Plan Assets [3]   38,412  
Level 2 [Member] | Domestic Equity Securities [Member]      
Fair Value of Plan Assets [4]   23,384  
Level 2 [Member] | International Equity Securities [Member]      
Fair Value of Plan Assets [5]   21,848  
Level 2 [Member] | Emerging Markets [Member]      
Fair Value of Plan Assets [6]   $ 21,225  
[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. Level 2 assets are collective investments in inflation-indexed bonds, securities of real estate companies, commodity index-linked notes, fixed income securities, foreign currencies, securities of natural resource companies, master limited partnerships, publicly listed infrastructure companies, floating-rate debt, securities of global agriculture companies and securities of global timber companies.
[4] Level 1 assets are managed investments in the U.S., small/mid-cap equities that track the Russell 2500 Growth index or Russell 2500 Value index. Level 2 assets are collective investments, which are invested in U.S. large-cap equities that track the S&P 500.
[5] Level 2 assets are collective investments in equity funds of developed markets outside of the United States and Canada that track the MSCI EAFE Value index or MSCI EAFE Growth index.
[6] Level 1 assets are mutual funds which are invested in the common stock of companies located (or with primary operations) in emerging markets that track the MSCI Emerging Markets index. Level 2 assets are collective investments in the common stock of companies located (or with primary operations) in emerging markets that track the MSCI Emerging Markets index.