Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Revenues
Total revenues	$ 66,063	$ 100,403	[1]	$ 172,690	$ 194,255	[1]
Operating expenses
Costs of product sales	2,215	12,022	[1]	10,647	20,087	[1]
Operating and maintenance	14,508	17,276	[1]	31,348	36,966	[1]
Depreciation and amortization	11,881	8,691	[1]	22,078	17,682	[1]
Impairment	216	0	[1]	101,983	0	[1]
General and administrative	9,286	7,834	[1]	17,737	16,557	[1]
Total operating expenses	38,106	45,823	[1]	183,793	91,292	[1]
Operating income (loss)	27,957	54,580	[1]	(11,103)	102,963	[1]
Other expenses
Interest expense, net of capitalized interest	(5,186)	(4,330)	[1]	(35,443)	(8,299)	[1]
Other expenses	(101)	(4)	[1]	(143)	(4)	[1]
Total other expenses	(5,287)	(4,334)	[1]	(35,586)	(8,303)	[1]
Net income (loss)	22,670	50,246	[1]	(46,689)	94,660	[1]
Less: Net income attributable to Delaware Predecessor	0	1,211	[1]	0	2,286	[1]
Less: Net income attributable to non-controlling interests	10,796	22,837	[1]	12,836	44,633
Net income (loss) attributable to Oasis Midstream Partners LP	$ 11,874	$ 26,198	[1]	$ (59,525)	$ 47,741
Earnings per limited partner unit
Common units - Basic (in usd per share)	$ 0.32	$ 0.76	[1]	$ (1.82)	$ 1.39	[1]
Common units - Diluted (in usd per share)	$ 0.32	$ 0.76	[1]	$ (1.82)	$ 1.39	[1]
Common Units
Weighted average number of limited partner units outstanding
Weighted average number of limited partner units outstanding (Basic) (shares)	20,045	20,024	[1]	20,043	20,020	[1]
Weighted average number of limited partner units outstanding (Diluted) (shares)	20,045	20,034	[1]	20,043	20,037	[1]
General Partner
Other expenses
Net income (loss)	$ 1,027	$ 491	[2]
Net income (loss) attributable to Oasis Midstream Partners LP	1,027	491	[1]	$ 2,034	$ 729	[1]
Limited Partner
Other expenses
Net income (loss) attributable to Oasis Midstream Partners LP	10,847	25,707	[1]	$ (61,559)	$ 47,012
Limited Partner | Common Units
Other expenses
Net income (loss)	$ 6,433	$ 15,241	[2]
Weighted average number of limited partner units outstanding
Weighted average number of limited partner units outstanding (Basic) (shares)	20,045	20,024		20,043	20,020
Weighted average number of limited partner units outstanding (Diluted) (shares)	20,045	20,034		20,043	20,037
Midstream service revenues
Revenues
Total revenues	$ 62,188	$ 76,036		$ 148,027	$ 154,226
Midstream service revenues | Oasis Petroleum
Revenues
Total revenues	56,946	74,211	[1]	138,939	151,274	[1]
Midstream service revenues | Third Parties
Revenues
Total revenues	5,242	1,825	[1]	9,088	2,952	[1]
Product revenues
Revenues
Total revenues	3,875	24,367		24,663	40,029
Product revenues | Oasis Petroleum
Revenues
Total revenues	3,869	24,348	[1]	24,657	40,000	[1]
Product revenues | Third Parties
Revenues
Total revenues	$ 6	$ 19	[1]	$ 6	$ 29	[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.