Supplemental Information

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Information

Supplemental Information

Accrued Liabilities

Accrued liabilities were $15,150 and $15,697 at March 31, 2018 and December 31, 2017, respectively. The accrued interest, accrued maintenance, capital expenditures accrual and accrued taxes, which are components of accrued liabilities, were $4,864, $3,406, $2,179 and $2,115, respectively, at March 31, 2018, and $4,590, $3,698, $3,197 and $1,422, respectively, at December 31, 2017. No other component of accrued liabilities was more than five percent of total current liabilities.

Non-cash Investing Activity

The change in capital expenditure accrual reducing additions to property, plant and equipment was $117 for the three months ended March 31, 2018. The change in capital expenditure accrual reducing additions to property, plant and equipment was $1,159 for the three months ended March 31, 2017.