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Other Noncurrent Liabilities - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Payables and Accruals [Abstract]      
Benefit plan liabilities $ 186,114 $ 168,539 $ 179,720
Noncurrent tax liabilities 127,912 124,330 98,208
Other 148,648 191,257 171,034
Total other noncurrent liabilities $ 462,674 $ 484,126 $ 448,962