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Benefit Plans - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Pension Plans | United States |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |
Net gain (loss) | $ 2,486 | $ (3,328)
Gross amount recognized | 2,486 | (3,328)
Deferred income taxes | (3,158) | 3,699
Net amount recognized | (672) | 371
Defined Benefit Pension Plans | Foreign |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |
Net gain (loss) | 0 | (2,166)
Gross amount recognized | 0 | (2,166)
Deferred income taxes | 0 | 968
Net amount recognized | 0 | (1,198)
Other Postretirement Benefits Plans |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |
Prior service credit | 364 | 596
Net gain (loss) | (114) | (159)
Gross amount recognized | 250 | 437
Deferred income taxes | (309) | (199)
Net amount recognized | $ (59) | $ 238

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