Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Schedule of Cash Paid (Received)) (Details)

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Derivative Instruments and Hedging Activities (Schedule of Cash Paid (Received)) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities    
Cash received (paid) for commodity derivative settlements, net $ (42,162) $ 2,613
Not Designated as Hedging Instrument | (Gain) loss on contingent consideration arrangements    
Cash flows from investing activities    
Cash paid for settlements of contingent consideration arrangements, net 0 (40,000)
Commodity - Oil | Not Designated as Hedging Instrument    
Cash flows from operating activities    
Cash received (paid) for commodity derivative settlements, net (39,947) (1,777)
Commodity - Natural gas | Not Designated as Hedging Instrument    
Cash flows from operating activities    
Cash received (paid) for commodity derivative settlements, net (1,369) 4,390
Natural gas liquids | Not Designated as Hedging Instrument    
Cash flows from operating activities    
Cash received (paid) for commodity derivative settlements, net $ (846) $ 0