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Benefit Plans Amounts Recognized in the Balance Sheet - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | $ 51,619 | $ 44,536
Liability, Defined Benefit Plan, Current | 5,835 | 5,388
Liability, Defined Benefit Plan, Noncurrent | 194,789 | 179,382
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 400,685 | 349,715
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | 251,680 | 209,481
Pension Plan [Member] | Foreign Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | 51,619 | 44,536
Liability, Defined Benefit Plan, Current | 5,549 | 5,023
Liability, Defined Benefit Plan, Noncurrent | 153,559 | 138,813
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 332,280 | 286,370
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | 224,791 | 187,070
Pension Plan [Member] | UNITED STATES |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0
Liability, Defined Benefit Plan, Current | 133 | 126
Liability, Defined Benefit Plan, Noncurrent | 40,353 | 39,512
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 69,296 | 64,269
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | 28,810 | 24,631
Other Postretirement Benefits Plan [Member] | UNITED STATES |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0
Liability, Defined Benefit Plan, Current | 153 | 239
Liability, Defined Benefit Plan, Noncurrent | 877 | 1,057
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | (891) | (924)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | $ (1,921) | $ (2,220)

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