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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value of Plan Assets $ 351,285 $ 313,862 $ 289,675
Cash and Cash Equivalents [Member]      
Fair Value of Plan Assets 4,120 3,004  
Domestic Equity Securities [Member]      
Fair Value of Plan Assets [1] 54,699 57,560  
International Equity Securities [Member]      
Fair Value of Plan Assets [2] 21,848 28,413  
Emerging Markets [Member]      
Fair Value of Plan Assets [3] 28,134 29,257  
Fixed Income Securities [Member]      
Fair Value of Plan Assets [4] 204,072 148,833  
Alternative Securities [Member]      
Fair Value of Plan Assets [5] 38,412 46,795  
Level 1 [Member]      
Fair Value of Plan Assets 246,416 181,027  
Level 1 [Member] | Cash and Cash Equivalents [Member]      
Fair Value of Plan Assets 4,120 3,004  
Level 1 [Member] | Domestic Equity Securities [Member]      
Fair Value of Plan Assets [1] 31,315 29,178  
Level 1 [Member] | Emerging Markets [Member]      
Fair Value of Plan Assets [3] 6,909 12  
Level 1 [Member] | Fixed Income Securities [Member]      
Fair Value of Plan Assets [4] 204,072 148,833  
Level 2 [Member]      
Fair Value of Plan Assets 104,869 132,835  
Level 2 [Member] | Domestic Equity Securities [Member]      
Fair Value of Plan Assets [1] 23,384 28,382  
Level 2 [Member] | International Equity Securities [Member]      
Fair Value of Plan Assets [2] 21,848 28,413  
Level 2 [Member] | Emerging Markets [Member]      
Fair Value of Plan Assets [3] 21,225 29,245  
Level 2 [Member] | Alternative Securities [Member]      
Fair Value of Plan Assets [5] $ 38,412 $ 46,795  
[1] Level 1 assets are managed investments in 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.
[2] 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
[3] 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.
[4] Level 1 assets are mutual funds and investments in a diversified portfolio of fixed income instruments of varying maturities representing corporates, sovereign debt, U.S. treasuries and municipals that track the Bloomberg Barclay's Long-term Credit index.
[5] 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.