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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets    
Cash, cash equivalents and restricted cash $ 116,454 $ 189,754
Collateral on derivatives 4,380 909
Fair value of derivative assets – current 8,653 8,479
Fair value of derivative assets – noncurrent 5,435 8,184
Liabilities    
Fair value of derivative liabilities – current 585 163
Global Ultraco Debt Facility    
Liabilities    
Debt instrument 275,400 237,750
Convertible Bond Debt    
Liabilities    
Debt instrument 104,119 104,119
Recurring | Level 1    
Assets    
Cash, cash equivalents and restricted cash 116,454 189,754
Collateral on derivatives 4,380 909
Fair value of derivative assets – current 0 0
Fair value of derivative assets – noncurrent 0 0
Liabilities    
Fair value of derivative liabilities – current 0 0
Recurring | Level 1 | Global Ultraco Debt Facility    
Liabilities    
Debt instrument 0 0
Recurring | Level 1 | Convertible Bond Debt    
Liabilities    
Debt instrument 0 0
Recurring | Level 2    
Assets    
Cash, cash equivalents and restricted cash 0 0
Collateral on derivatives 0 0
Fair value of derivative assets – current 8,653 8,479
Fair value of derivative assets – noncurrent 5,435 8,184
Liabilities    
Fair value of derivative liabilities – current 585 163
Recurring | Level 2 | Global Ultraco Debt Facility    
Liabilities    
Debt instrument 275,400 237,750
Recurring | Level 2 | Convertible Bond Debt    
Liabilities    
Debt instrument $ 146,839 $ 172,661