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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Summary of Changes in Estimated Oil and Natural Gas Reserves (Unaudited) (Details) Mcf in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 MBoe MBbls Mcf | Oct. 01, 2016 MBoe Mcf MBbls | Dec. 31, 2018 MBoe MBbls Mcf | Dec. 31, 2017 MBoe Mcf MBbls | Dec. 31, 2016 MBoe MBbls Mcf | Dec. 31, 2015 MBoe MBbls Mcf
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, Beginning balance (MBoe) | MBoe |  |  | 177,600 |  |  |
Revisions of previous estimates (MBoe) | MBoe |  |  | (24,900) | 10,900 | (105,400) |
Acquisitions of new reserves (MBoe) | MBoe |  |  | 15,400 |  |  |
Extensions and discoveries (MBoe) | MBoe |  |  | 19,300 | 19,400 | 7,800 |
Sales of reserves in place (MBoe) | MBoe |  |  | (6,600) | (1,900) | (24,600) |
Proved developed and undeveloped reserves, Ending balance (MBoe) | MBoe |  |  | 160,200 | 177,600 |  |
Predecessor |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, Beginning balance (MBoe) | MBoe | 137,992 | 324,626 |  |  | 324,626 |
Adoption of ASU 2015-02 (MBoe) | MBoe |  | (19,084) |  |  |  |
Revisions of previous estimates (MBoe) | MBoe |  | (130,709) |  |  |  |
Extensions and discoveries (MBoe) | MBoe |  | 2,785 |  |  |  |
Sales of reserves in place (MBoe) | MBoe |  | (24,598) |  |  |  |
Production (MBoe) | MBoe |  | (15,027) |  |  |  |
Proved developed and undeveloped reserves, Ending balance (MBoe) | MBoe |  | 137,992 |  |  |  |
Proved developed reserves (MBoe) | MBoe |  | 126,121 |  |  |  | 260,498
Proved undeveloped reserves (MBoe) | MBoe |  | 11,872 |  |  |  | 64,129
Predecessor | Oil |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | 27,252 | 77,911 |  |  | 77,911 |
Adoption of ASU 2015-02 |  | (6,971) |  |  |  |
Revisions of previous estimates |  | (39,973) |  |  |  |
Extensions and discoveries |  | 987 |  |  |  |
Sales of reserves in place |  | (387) |  |  |  |
Production |  | (4,315) |  |  |  |
Proved developed and undeveloped reserves, ending balance |  | 27,252 |  |  |  |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  | 24,541 |  |  |  | 48,639
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  | 2,711 |  |  |  | 29,272
Predecessor | Oil | Non-controlling Interest |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  | 7,004 |  |  | 7,004 |
Predecessor | NGL |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | 33,019 | 61,075 |  |  | 61,075 |
Adoption of ASU 2015-02 |  | (3,695) |  |  |  |
Revisions of previous estimates |  | (21,475) |  |  |  |
Extensions and discoveries |  | 472 |  |  |  |
Sales of reserves in place |  | 0 |  |  |  |
Production |  | (3,358) |  |  |  |
Proved developed and undeveloped reserves, ending balance |  | 33,019 |  |  |  |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  | 30,238 |  |  |  | 51,089
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  | 2,781 |  |  |  | 9,986
Predecessor | NGL | Non-controlling Interest |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  | 3,694 |  |  | 3,694 |
Predecessor | Natural gas |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | Mcf | 466,328 | 1,113,840 |  |  | 1,113,840 |
Adoption of ASU 2015-02 | Mcf |  | (50,508) |  |  |  |
Revisions of previous estimates | Mcf |  | (415,568) |  |  |  |
Extensions and discoveries | Mcf |  | 7,955 |  |  |  |
Sales of reserves in place | Mcf |  | (145,267) |  |  |  |
Production | Mcf |  | (44,124) |  |  |  |
Proved developed and undeveloped reserves, ending balance | Mcf |  | 466,328 |  |  |  |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf |  | 428,050 |  |  |  | 964,617
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf |  | 38,278 |  |  |  | 149,223
Predecessor | Natural gas | Non-controlling Interest |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | Mcf |  | 50,508 |  |  | 50,508 |
Successor |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, Beginning balance (MBoe) | MBoe |  |  | 177,594 | 163,955 |  |
Revisions of previous estimates (MBoe) | MBoe | 25,270 |  | (33,188) | 10,879 |  |
Acquisitions of new reserves (MBoe) | MBoe |  |  | 15,350 | 202 |  |
Extensions and discoveries (MBoe) | MBoe | 5,034 |  | 19,332 | 19,373 |  |
Sales of reserves in place (MBoe) | MBoe |  |  | (6,577) | (1,909) |  |
Production (MBoe) | MBoe | (4,341) |  | (12,335) | (14,906) |  |
Proved developed and undeveloped reserves, Ending balance (MBoe) | MBoe | 163,955 |  | 160,176 | 177,594 | 163,955 |
Proved developed reserves (MBoe) | MBoe | 120,706 |  | 92,303 | 123,765 | 120,706 |
Proved undeveloped reserves (MBoe) | MBoe | 43,249 |  | 67,873 | 53,829 | 43,249 |
Successor | Oil |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  |  | 61,791 | 52,884 |  |
Revisions of previous estimates | 23,978 |  | (2,316) | 804 |  |
Acquisitions of new reserves |  |  | 2,146 | 18 |  |
Extensions and discoveries | 2,868 |  | 11,148 | 12,446 |  |
Sales of reserves in place |  |  | (5,273) | (204) |  |
Production | (1,214) |  | (3,477) | (4,157) |  |
Proved developed and undeveloped reserves, ending balance | 52,884 |  | 64,019 | 61,791 | 52,884 |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 25,911 |  | 18,693 | 25,845 | 25,911 |
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 26,973 |  | 45,326 | 35,946 | 26,973 |
Successor | NGL |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  |  | 34,314 | 33,607 |  |
Revisions of previous estimates | 1,139 |  | (8,952) | 2,628 |  |
Acquisitions of new reserves |  |  | 4,131 | 70 |  |
Extensions and discoveries | 448 |  | 2,320 | 1,914 |  |
Sales of reserves in place |  |  | (809) | (529) |  |
Production | (999) |  | (2,829) | (3,376) |  |
Proved developed and undeveloped reserves, ending balance | 33,607 |  | 28,175 | 34,314 | 33,607 |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 29,290 |  | 22,302 | 29,922 | 29,290 |
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 4,317 |  | 5,873 | 4,392 | 4,317 |
Successor | Natural gas |  |  |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | Mcf |  |  | 488,932 | 464,782 |  |
Revisions of previous estimates | Mcf | 915 |  | (131,518) | 44,679 |  |
Acquisitions of new reserves | Mcf |  |  | 54,436 | 683 |  |
Extensions and discoveries | Mcf | 10,309 |  | 35,185 | 30,080 |  |
Sales of reserves in place | Mcf |  |  | (2,969) | (7,055) |  |
Production | Mcf | (12,770) |  | (36,175) | (44,237) |  |
Proved developed and undeveloped reserves, ending balance | Mcf | 464,782 |  | 407,891 | 488,932 | 464,782 |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf | 393,028 |  | 307,845 | 407,988 | 393,028 |
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf | 71,754 |  | 100,046 | 80,944 | 71,754 |

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