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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities    
Capital expenditures $ 48,067 $ 63,286
Operating expenses 35,607 29,905
Interest expense 1,988 10,508
Other 2,596 2,307
Accrued liabilities $ 88,258 $ 106,006