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International Retirement Plan (Summary of Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Retirement Benefits, Description [Abstract] |  |
Other assets | $ 3,224 | $ 3,207
Accrued liabilities | (140) | (144)
Other liabilities | (8,518) | (8,290)
Net liability | $ (5,434) | $ (5,227)

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