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Employee Benefit Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Retirement Benefits [Abstract] |  |
Liability, Defined Benefit Plan, Noncurrent | $ (14,469) | $ (12,833)
Accumulated other comprehensive loss | $ (41,822) | $ (40,937)

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