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Fresh-Start Accounting - Oil and Natural Gas Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Feb. 28, 2017
Components of Oil and Natural Gas Properties      
Proved properties $ 1,073,959 $ 825,416 $ 712,400
Unproved properties 388,034 517,037 531,200
Total proved and unproved properties 1,461,993 1,342,453 1,243,600
Less accumulated depletion and amortization (123,217) (54,785) 0
Total oil and natural gas properties, net $ 1,338,776 $ 1,287,668 1,243,600
Predecessor      
Components of Oil and Natural Gas Properties      
Proved properties     4,266,843
Unproved properties     764,655
Total proved and unproved properties     5,031,498
Less accumulated depletion and amortization     (2,814,999)
Total oil and natural gas properties, net     $ 2,216,499