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Acquisition - Pro-Forma Information (Details) - Permian Basin Acquisition [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Revenues	$ 546,449	$ 318,879	$ 1,474,530	$ 871,952
Net income (loss) attributable to Oasis	$ 62,341	$ (29,717)	$ (252,731)	$ 22,068
Basic (in usd per share)	$ 0.20	$ (0.11)	$ (0.81)	$ 0.08
Diluted (in usd per share)	$ 0.20	$ (0.11)	$ (0.81)	$ 0.08

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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