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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.

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