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Supplemental Information	6 Months Ended
Supplemental Information	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Information	Supplemental Information Accrued Liabilities Accrued liabilities were $16,807 and $17,507 at June 30, 2020 and December 31, 2019, respectively. Accrued interest, accrued taxes, and accrued maintenance expense, which are components of accrued liabilities, were $3,431, $4,770, and $3,411, respectively, at June 30, 2020 and $4,187, $2,611, and $3,225, 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 $182 and $567 for the six months ended June 30, 2020 and 2019, respectively.