Supplemental Information

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Information

Supplemental Information

Accrued Liabilities

Accrued liabilities were $20,433 and $16,250 at March 31, 2019 and December 31, 2018, respectively. Accrued interest, accrued maintenance, capital expenditures and accrued taxes, which are components of accrued liabilities, were $5,852, $3,850, $2,827 and $2,931, respectively, at March 31, 2019, and $5,448, $2,688, $2,818 and $1,564, respectively, at December 31, 2018. 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 resulted in an increase in additions to property, plant and equipment by $52 for the three months ended March 31, 2019. The change in capital expenditure accrual resulted in a decrease in additions to property, plant and equipment by $117 for the three months ended March 31, 2018.