Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accrued Liabilities    
Capital expenditures $ 34,538 $ 63,286
Operating expenses 31,337 29,905
Interest expense 1,864 10,508
Other 2,630 2,307
Accrued liabilities $ 70,369 $ 106,006