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Pension and Postretirement Benefits - Amounts Recognized in AOCI (Details) - Domestic Plans - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Pension Plans | Funded Plans |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | $ 8,643 | $ 8,681
Subtotal | 8,643 | 8,681
Less tax effect | (2,182) | (3,292)
Total | 6,461 | 5,389
Pension Plans | Unfunded Pension Plans |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | 2,055 | 2,587
Subtotal | 2,055 | 2,587
Less tax effect | (519) | (981)
Total | 1,536 | 1,606
Postretirement Benefit Plans |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | 2,549 | 2,784
Prior service credit | (146) | (351)
Subtotal | 2,403 | 2,433
Less tax effect | (607) | (923)
Total | 1,796 | 1,510
US Postretirement and Pension Plan |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | 13,247 | 14,052
Prior service credit | (146) | (351)
Subtotal | 13,101 | 13,701
Less tax effect | (3,308) | (5,196)
Total | $ 9,793 | $ 8,505

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