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Pension and Postretirement Benefits - Amounts Recognized in AOCI (Details) - Domestic Plans - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ 9,252 | $ 8,856
Subtotal | 9,252 | 8,856
Less tax effect |  | (2,236)
Total | 9,252 | 6,620
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 | 3,409 | 2,744
Subtotal | 3,409 | 2,744
Less tax effect |  | (693)
Total | 3,409 | 2,051
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 | 1,990 | 1,320
Prior service credit | 189 | 43
Subtotal | 2,179 | 1,363
Less tax effect |  | (344)
Total | 2,179 | 1,019
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 | 14,651 | 12,920
Prior service credit | 189 | 43
Subtotal | 14,840 | 12,963
Less tax effect |  | (3,273)
Total | $ 14,840 | $ 9,690

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