Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities    
Capital expenditures $ 63,286 $ 35,608
Operating expenses 29,905 14,582
Interest expense 10,508 10,613
Other 2,307 838
Accrued liabilities $ 106,006 $ 61,641