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Pension and Postretirement Benefits (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 20,000 | $ 20,400 | $ 18,700
Postretirement Medical Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.32% | 3.27% | 4.20%
Company contributions | $ 3,200 | $ 2,900 | $ 3,200
Assumed rate of increase in medical costs | 7.00% | 7.50% | 7.00%
Minimum medical cost rate to be acheived | 5.00% |  |
United States | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.62% | 3.41% | 4.34%
Long-term rate of return on assets | 6.00% | 6.00% | 6.00%
Company contributions | $ 1,412 | $ 20,552 |
United States | Pension Plan | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contributions in the next year | $ 20,000 |  |
United States | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets, target allocation (as a percent) | 43.00% |  |
United States | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets, target allocation (as a percent) | 57.00% |  |
United States | Fixed Income | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets, target allocation (as a percent) | 57.00% | 57.00% |
Plan assets, actual allocation (as a percent) | 56.00% | 59.00% |
Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate |  |  | 2.42%
Long-term rate of return on assets |  |  | 3.62%
Foreign Plan | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 1.23% | 1.61% |
Long-term rate of return on assets | 2.37% | 3.37% |
Company contributions | $ 11,279 | $ 16,782 |
Estimated contributions in the next year | $ 2,000 |  |
Number of plans Non-US Assets | plan | 2 |  |
Foreign Plan | Fixed Income | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets, target allocation (as a percent) | 51.00% | 50.00% |
Plan assets, actual allocation (as a percent) | 51.00% | 50.00% |
Foreign Plan | U.K. , the Netherlands and Canadian Plan Assets | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets, actual allocation (as a percent) | 94.00% |  |

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