v3.10.0.1
Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities    
Capital expenditures $ 26,354 $ 63,286
Operating expenses 32,818 29,905
Interest expense 10,922 10,508
Other 2,027 2,307
Total accrued liabilities $ 72,121 $ 106,006