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Supplemental Information	9 Months Ended
Supplemental Information	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Information	Supplemental Information Accrued Liabilities Accrued liabilities were $16,955 and $17,507 at September 30, 2020 and December 31, 2019, respectively. Accrued taxes, accrued maintenance expense and accrued interest, which are components of accrued liabilities, were $5,550, $4,054 and $2,320, respectively, at September 30, 2020 and $2,611, $3,225 and $4,187, respectively, at December 31, 2019. No other component of accrued liabilities was more than five percent of total current liabilities. Non-cash Investing Activity The non-cash investing activities related to accruals for capital expenditures were $1,945 and $1,213 for the nine months ended September 30, 2020 and 2019, respectively.