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Fresh-Start Accounting - Oil and Natural Gas Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Feb. 28, 2017
Components of Oil and Natural Gas Properties      
Proved properties $ 1,361,814 $ 1,073,959 $ 712,400
Unproved properties 313,903 388,034 531,200
Oil and natural gas properties 1,675,717 1,461,993 1,243,600
Less accumulated depletion and amortization (209,105) (123,217) 0
Total oil and natural gas properties, net $ 1,466,612 $ 1,338,776 1,243,600
Previously Reported      
Components of Oil and Natural Gas Properties      
Proved properties     4,266,843
Unproved properties     764,655
Oil and natural gas properties     5,031,498
Less accumulated depletion and amortization     (2,814,999)
Total oil and natural gas properties, net     $ 2,216,499