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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets:    
Total assets   $ 467
Liabilities:    
Total liabilities $ 253,010 94,558
Commodity contracts    
Liabilities:    
Total liabilities 253,010 94,558
Commodity contracts    
Assets:    
Total assets   467
Level 1    
Assets:    
Total assets   0
Liabilities:    
Total liabilities 0 0
Level 1 | Commodity contracts    
Liabilities:    
Total liabilities 0 0
Level 1 | Commodity contracts    
Assets:    
Total assets   0
Level 2    
Assets:    
Total assets   467
Liabilities:    
Total liabilities 253,010 94,558
Level 2 | Commodity contracts    
Liabilities:    
Total liabilities 253,010 94,558
Level 2 | Commodity contracts    
Assets:    
Total assets   467
Level 3    
Assets:    
Total assets   0
Liabilities:    
Total liabilities 0 0
Level 3 | Commodity contracts    
Liabilities:    
Total liabilities $ 0 0
Level 3 | Commodity contracts    
Assets:    
Total assets   $ 0