Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Revenues
Total revenues	$ 84,555	$ 103,550	[1]	$ 257,245	$ 297,805	[1]
Operating expenses
Costs of product sales	5,958	7,001	[1]	16,605	27,088	[1]
Operating and maintenance	12,682	18,009	[1]	44,030	54,975	[1]
Depreciation and amortization	9,083	9,143	[1]	31,161	26,825	[1]
Impairment	1,458	0	[1]	103,441	0	[1]
General and administrative	8,870	7,665	[1]	26,607	24,222	[1]
Total operating expenses	38,051	41,818	[1]	221,844	133,110	[1]
Operating income	46,504	61,732	[1]	35,401	164,695	[1]
Other expenses
Interest expense, net of capitalized interest	(2,753)	(4,612)	[1]	(38,196)	(12,911)	[1]
Other expenses	(7)	0	[1]	(150)	(4)	[1]
Total other expenses	(2,760)	(4,612)	[1]	(38,346)	(12,915)	[1]
Net income (loss)	43,744	57,120	[2]	(2,945)	151,780	[1]
Less: Net income attributable to Delaware Predecessor	0	1,818	[1]	0	4,104	[1]
Less: Net income attributable to non-controlling interests	16,483	23,866	[1]	29,319	68,499	[1]
Net income (loss) attributable to Oasis Midstream Partners LP	$ 27,261	$ 31,436	[1]	$ (32,264)	$ 79,177	[1]
Earnings per limited partner unit
Common units - Basic (in usd per share)	$ 0.78	$ 0.91	[1]	$ (1.05)	$ 2.30	[1]
Common units - Diluted (in usd per share)	$ 0.78	$ 0.91	[1]	$ (1.05)	$ 2.30	[1]
Common Units
Weighted average number of limited partner units outstanding
Weighted average number of limited partner units outstanding (Basic) (shares)	20,045	20,027	[1]	20,044	20,022	[1]
Weighted average number of limited partner units outstanding (Diluted) (shares)	20,048	20,038	[1]	20,044	20,039	[1]
General Partner
Other expenses
Net income (loss)	$ 1,027	$ 745	[2]
Net income (loss) attributable to Oasis Midstream Partners LP	1,027	745	[1]	$ 3,062	$ 1,474	[1]
Limited Partner
Other expenses
Net income (loss) attributable to Oasis Midstream Partners LP	26,234	30,691	[1]	$ (35,326)	$ 77,703	[1]
Limited Partner | Common Units
Other expenses
Net income (loss)	$ 15,560	$ 18,198	[2]
Weighted average number of limited partner units outstanding
Weighted average number of limited partner units outstanding (Basic) (shares)	20,045	20,027		20,044	20,022
Weighted average number of limited partner units outstanding (Diluted) (shares)	20,048	20,038		20,044	20,039
Midstream service revenues
Revenues
Total revenues	$ 69,354	$ 83,024		$ 217,381	$ 237,250
Midstream service revenues | Oasis Petroleum
Revenues
Total revenues	67,401	81,184	[1]	206,340	232,458	[1]
Midstream service revenues | Third Parties
Revenues
Total revenues	1,953	1,840	[1]	11,041	4,792	[1]
Product revenues
Revenues
Total revenues	15,201	20,526		39,864	60,555
Product revenues | Oasis Petroleum
Revenues
Total revenues	15,184	20,517	[1]	39,841	60,517	[1]
Product revenues | Third Parties
Revenues
Total revenues	$ 17	$ 9	[1]	$ 23	$ 38	[1]

[1] Retrospectively adjusted for the transfer of net assets between entities under common control. See Note 2 to our unaudited condensed consolidated financial statements.

[2] Retrospectively adjusted for the transfer of net assets between entities under common control. See Note 2 to our unaudited condensed consolidated financial statements.