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Supplemental Information	6 Months Ended
Supplemental Information	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Information	Supplemental Information Accrued and Other Liabilities Accrued and other liabilities were $16,084 and $18,768 at June 30, 2021 and December 31, 2020, respectively. Accrued taxes, accrued maintenance expense and accrued capital expenditures, which are components of accrued liabilities, were $3,925, $3,025 and $2,823, respectively, at June 30, 2021 and $6,207, $3,905 and $2,286, respectively, at December 31, 2020. No other component of accrued and other 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 $669 and $182 for the six months ended June 30, 2021 and 2020, respectively.