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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial assets    
Derivative asset - current $ 17 $ 7,509
Derivative asset - noncurrent 453 396
Financial liabilities    
Derivative liability - current 67,575 1,135
Derivative liability - noncurrent 7,730 173
Fair Value on a Recurring Basis    
Financial assets    
Derivative asset - current 17 7,509
Derivative asset - noncurrent 453 396
Total financial assets 470 7,905
Financial liabilities    
Derivative liability - current 67,575 1,135
Derivative liability - noncurrent 7,730 173
Share-based compensation liability - noncurrent 3,680  
Total financial liabilities 78,985 1,308
Level 1 | Fair Value on a Recurring Basis    
Financial assets    
Derivative asset - current 0 0
Derivative asset - noncurrent 0 0
Total financial assets 0 0
Financial liabilities    
Derivative liability - current 0 0
Derivative liability - noncurrent 0 0
Share-based compensation liability - noncurrent 0  
Total financial liabilities 0 0
Level 2 | Fair Value on a Recurring Basis    
Financial assets    
Derivative asset - current 17 7,509
Derivative asset - noncurrent 453 396
Total financial assets 470 7,905
Financial liabilities    
Derivative liability - current 67,575 1,135
Derivative liability - noncurrent 7,730 173
Share-based compensation liability - noncurrent 3,680  
Total financial liabilities 78,985 1,308
Level 3 | Fair Value on a Recurring Basis    
Financial assets    
Derivative asset - current 0 0
Derivative asset - noncurrent 0 0
Total financial assets 0 0
Financial liabilities    
Derivative liability - current 0 0
Derivative liability - noncurrent 0 0
Share-based compensation liability - noncurrent 0  
Total financial liabilities $ 0 $ 0