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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Non-current assets | $ 12,790 | $ 19,273
Pension Benefits |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Non-current assets | 12,790 | 19,273
Current liabilities | (5) | (4)
Non-current liabilities | (250) | (225)
Accumulated other comprehensive (loss) income | 12,535 | 19,044
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |
Net actuarial (loss) gain | (13,085) | (59,972)
Prior service benefit | 0 | 0
Accumulated other comprehensive (loss) income | (13,085) | (59,972)
Other Postretirement Benefits |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Non-current assets | 0 | 0
Current liabilities | (282) | (334)
Non-current liabilities | (1,317) | (1,469)
Accumulated other comprehensive (loss) income | (1,599) | (1,803)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |
Net actuarial (loss) gain | 54 | 68
Prior service benefit | 209 | 1,220
Accumulated other comprehensive (loss) income | $ 263 | $ 1,288

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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