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Supplemental Information	6 Months Ended
Supplemental Information	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Information	Supplemental Information Accrued Liabilities Accrued liabilities were $18,996 and $15,697 at June 30, 2018 and December 31, 2017, respectively. The accrued interest, accrued maintenance, capital expenditures accrual and accrued taxes, which are components of accrued liabilities, were $5,560, $3,696, $3,332 and $3,432, respectively, at June 30, 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 resulted in a decrease in additions to property, plant and equipment by $5,042 for the six months ended June 30, 2018. The change in capital expenditure accrual resulted in an increase in additions to property, plant and equipment by $293 for the six months ended June 30, 2017.