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Fair Value Measures and Disclosures (Tables)
 6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
Fair Value
June 30, 2023
Carrying ValueLevel 1Level 2
Assets
Cash, cash equivalents and restricted cash$118,278 $118,278 $— 
Collateral on derivatives676 676 — 
Fair value of derivative assets – current9,814 — 9,814 
Fair value of derivative assets – noncurrent6,331 — 6,331 
Liabilities
Global Ultraco Debt Facility (1)(2)
287,850 — 287,850 
Convertible Bond Debt (1)(3)
104,119 — 160,489 
Fair value of derivative liabilities – current8 — 8 
Fair Value
December 31, 2022
Carrying ValueLevel 1Level 2
Assets
Cash, cash equivalents and restricted cash$189,754 $189,754 $— 
Collateral on derivatives909 909 — 
Fair value of derivative assets – current8,479 — 8,479 
Fair value of derivative assets – noncurrent8,184 — 8,184 
Liabilities
Global Ultraco Debt Facility (1)(2)
237,750 — 237,750 
Convertible Bond Debt (1)(3)
104,119 — 172,661 
Fair value of derivative liabilities – current163 — 163 
(1)
Carrying value represents outstanding principal amount and excludes debt discounts and debt issuance costs.
(2)
Fair value is based on the required repayment to the lenders if the debt was discharged in full on June 30, 2023 and December 31, 2022, as applicable.
(3)Fair value is based on pricing data (including observable trade information) sourced from Bloomberg.com.