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Other Noncurrent Liabilities - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Payables and Accruals [Abstract]      
Benefit plan liabilities $ 183,214 $ 186,380 $ 177,289
Noncurrent income tax liabilities 146,297 150,960 156,135
Other 90,185 132,329 138,086
Total other noncurrent liabilities $ 419,696 $ 469,669 $ 471,510