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Subsequent Events Subsequent Events (Details) $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
Feb. 22, 2019 USD ($) shareholder director | Dec. 31, 2018 | Feb. 21, 2019
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Number of shareholders in eligible group | shareholder | 20 |  |
Minimum ownership percentage as eligible shareholder (percent) | 3.00% |  |
Eligible shareholder common stock holding period | 3 years |  |
Minimum number of directors that can be nominated by eligible shareholders | director | 2 |  |
Nominees as percentage of directors on current board (percent) | 20.00% |  |
Oasis Petroleum | Bobcat DevCo |  |  |
Subsequent Event [Line Items] |  |  |
Ownership interest (percent) |  | 75.00% |
Oasis Midstream Partners, LP | Bobcat DevCo |  |  |
Subsequent Event [Line Items] |  |  |
Limited partner interest in OMP (percent) |  | 25.00% |
Affiliated Entity | 2019 Capital Expenditures Arrangement | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Estimate of reimbursable amounts from OMP | $ | $ 80 |  |
Minimum | Oasis Petroleum | Bobcat DevCo | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Ownership interest (percent) |  |  | 64.00%
Maximum | Oasis Petroleum | Bobcat DevCo | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Ownership interest (percent) |  |  | 66.00%

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