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Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Payables and Accruals [Abstract]      
Benefit plan liabilities $ 203,295 $ 212,280 $ 183,214
Noncurrent income tax liabilities $ 129,773 $ 125,515 $ 146,297