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Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
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Payables and Accruals [Abstract] |  |  |
Benefit plan liabilities | $ 209,501 | $ 212,280 | $ 184,220
Noncurrent income tax liabilities | $ 125,944 | $ 125,515 | $ 138,018

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