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Pension and Postretirement Benefits - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Domestic Plans | Funded Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | $ 15,572 | $ 14,235
Accumulated benefit obligation | 15,572 | 14,235
Fair value of plan assets | 11,291 | 10,299
Domestic Plans | Unfunded Pension Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 9,462 | 9,271
Accumulated benefit obligation | 9,454 | 9,224
Foreign Pension Plans | Funded Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 9,990 | 8,134
Accumulated benefit obligation | 9,347 | 7,581
Fair value of plan assets | 10,013 | 8,243
Foreign Pension Plans | Unfunded Pension Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 2,331 | 2,290
Accumulated benefit obligation | $ 2,331 | $ 2,290

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