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Pension and Other Postretirement Benefits - International Plans (Details) - Pension Benefits - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 247,304 | $ 216,744 |
Expected actuarial loss that will be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost in next fiscal year | 3,800 |  |
International Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Total projected benefit obligations | 48,800 | 43,900 |
Fair value of plan assets | 45,100 | 44,000 |
Pension expense | 900 | $ 400 | $ 900
Expected actuarial loss that will be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost in next fiscal year | $ 100 |  |

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