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Other Noncurrent Liabilities (Details) - Other noncurrent liabilities - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Other Commitments [Line Items]      
Benefit plan liabilities $ 210,048 $ 225,957 $ 209,501
Deferred income tax liability 69,374 60,892 58,007
Noncurrent income tax payable $ 67,161 $ 71,342 $ 71,037