Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Derivative Instruments and Hedging Activities (Schedule of Cash Paid (Received)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Cash received (paid) for commodity derivative settlements, net $ 98,870 $ (3,789) $ (27,272)
Not Designated as Hedging Instrument | Contingent consideration arrangements      
Cash flows from investing activities      
Cash paid for settlements of contingent consideration arrangements, net (40,000) 0 0
Commodity - Oil | Not Designated as Hedging Instrument      
Cash flows from operating activities      
Cash received (paid) for commodity derivative settlements, net 98,723 (11,188) (27,510)
Commodity - Natural gas | Not Designated as Hedging Instrument      
Cash flows from operating activities      
Cash received (paid) for commodity derivative settlements, net $ 147 $ 7,399 $ 238