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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Fair Value Measurements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value of Plan Assets $ 313,862 $ 289,675
Cash and Cash Equivalents [Member]    
Fair Value of Plan Assets 3,004 2,845
Domestic Equity Securities [Member]    
Fair Value of Plan Assets [1] 57,560 51,688
International Equity Securities [Member]    
Fair Value of Plan Assets [2] 28,413 26,555
Emerging Markets [Member]    
Fair Value of Plan Assets [3] 29,257 26,403
Fixed Income Securities [Member]    
Fair Value of Plan Assets [4] 148,833 138,897
Alternative Securities [Member]    
Fair Value of Plan Assets [5] 46,795 43,287
Level 1 [Member]    
Fair Value of Plan Assets 181,027 167,163
Level 1 [Member] | Cash and Cash Equivalents [Member]    
Fair Value of Plan Assets 3,004 2,845
Level 1 [Member] | Domestic Equity Securities [Member]    
Fair Value of Plan Assets [1] 29,178 25,409
Level 1 [Member] | Emerging Markets [Member]    
Fair Value of Plan Assets [3] 12 12
Level 1 [Member] | Fixed Income Securities [Member]    
Fair Value of Plan Assets [4] 148,833 138,897
Level 2 [Member]    
Fair Value of Plan Assets 132,835 122,512
Level 2 [Member] | Domestic Equity Securities [Member]    
Fair Value of Plan Assets [1] 28,382 26,279
Level 2 [Member] | International Equity Securities [Member]    
Fair Value of Plan Assets [2] 28,413 26,555
Level 2 [Member] | Emerging Markets [Member]    
Fair Value of Plan Assets [3] 29,245 26,391
Level 2 [Member] | Alternative Securities [Member]    
Fair Value of Plan Assets [5] $ 46,795 $ 43,287
[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 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.