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Other Noncurrent Liabilities - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Payables and Accruals [Abstract]      
Benefit plan liabilities $ 184,220 $ 166,289 $ 179,473
Noncurrent tax liabilities 138,018 150,960 122,425
Other 88,333 152,420 141,951
Total other noncurrent liabilities $ 410,571 $ 469,669 $ 443,849