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Other Noncurrent Liabilities (Details) - Other noncurrent liabilities - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Other Commitments [Line Items] |  |  |
Benefit plan liabilities | $ 202,601 | $ 225,957 | $ 203,295
Deferred income tax liability | $ 38,850 | $ 60,892 | $ 61,870

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