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