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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Assets    
Cash, cash equivalents and restricted cash $ 118,278 $ 189,754
Collateral on derivatives 676 909
Fair value of derivative assets – current 9,814 8,479
Fair value of derivative assets – noncurrent 6,331 8,184
Liabilities    
Fair value of derivative liabilities – current 8 163
Global Ultraco Debt Facility    
Liabilities    
Debt instrument 287,850 237,750
Convertible Bond Debt    
Liabilities    
Debt instrument 104,119 104,119
Recurring | Level 1    
Assets    
Cash, cash equivalents and restricted cash 118,278 189,754
Collateral on derivatives 676 909
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 9,814 8,479
Fair value of derivative assets – noncurrent 6,331 8,184
Liabilities    
Fair value of derivative liabilities – current 8 163
Recurring | Level 2 | Global Ultraco Debt Facility    
Liabilities    
Debt instrument 287,850 237,750
Recurring | Level 2 | Convertible Bond Debt    
Liabilities    
Debt instrument $ 160,489 $ 172,661