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Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Funded Status |  |
Funded status | $ (34,677) | $ (37,624)
Net unfunded amounts recognized in Consolidated Balance Sheets consist of: |  |
Current liabilities | (279) | (271)
Long-term liabilities | (34,398) | (37,353)
Total net unfunded amount recognized in Consolidated Balance Sheets | $ (34,677) | $ (37,624)

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