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International Retirement Plan (Schedule of Accumulated And Projected Benefit Obligations) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Retirement Benefits [Abstract] |  |  |
Projected benefit obligation | $ 10,497 | $ 8,658 | $ 8,434
Accumulated benefit obligation | $ 9,351 | $ 7,587 |

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