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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.

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