Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details)

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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Feb. 28, 2021
Dec. 31, 2020
September 2020 Warrants      
Liabilities      
September 2020 Warrants   $ (134,800)  
Level 1 | Warrants      
Liabilities      
September 2020 Warrants     $ 0
Level 2 | Warrants      
Liabilities      
September 2020 Warrants     0
Level 3 | Warrants      
Liabilities      
September 2020 Warrants $ 0   (79,428)
Recurring Basis      
Liabilities      
Financial guarantee contracts, deferred premium 15,000   11,200
Recurring Basis | Level 1      
Assets      
Commodity derivative instruments 0   0
Contingent consideration arrangements 0   0
Liabilities      
Commodity derivative instruments 0   0
Contingent consideration arrangements 0   0
Total net assets (liabilities) 0   0
Recurring Basis | Level 2      
Assets      
Commodity derivative instruments 560   921
Contingent consideration arrangements 5,375   1,816
Liabilities      
Commodity derivative instruments (207,933)   (97,060)
Contingent consideration arrangements (17,913)   (8,618)
Total net assets (liabilities) (219,911)   (102,941)
Recurring Basis | Level 3      
Assets      
Commodity derivative instruments 0   0
Contingent consideration arrangements 0   0
Liabilities      
Commodity derivative instruments 0   0
Contingent consideration arrangements 0   0
Total net assets (liabilities) $ 0   $ (79,428)