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Other Noncurrent Liabilities - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Payables and Accruals [Abstract]      
Benefit plan liabilities $ 183,294 $ 166,289 $ 186,114
Noncurrent tax liabilities 143,723 150,960 127,912
Other 82,298 152,420 148,648
Total other noncurrent liabilities $ 409,315 $ 469,669 $ 462,674