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Employee Benefit Plans - Amounts Recognized in the Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Amounts Recognized in the Balance Sheet |  |  |
Current liabilities | $ 1,654 | $ 1,223 | $ 1,333
Long-term liabilities | 29,396 | 36,259 | 35,293
Amounts recognized in the balance sheet | $ 31,050 | $ 37,482 | $ 36,626

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