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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accrued Liabilities      
Compensation and benefits $ 34,745   $ 45,875
Other accruals 89,874   56,054
Total $ 124,619 $ 95,331 $ 101,929