Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Total revenues		$ 271,623	$ 182,216	$ 120,852
Operating expenses
Costs of product sales		7,433	6,085	6,479
Operating and maintenance		63,123	39,441	22,796
Depreciation and amortization		28,404	15,730	8,525
General and administrative		23,897	18,597	12,112
Total operating expenses		122,857	79,853	49,912
Operating Income		148,766	102,363	70,940
Interest expense, net of capitalized interest		(2,343)	(6,965)	(5,481)
Other income (expense)		(14)	7	(474)
Total other expense		(2,357)	(6,958)	(5,955)
Income before income taxes		146,409	95,405	64,985
Income tax expense		0	(22,858)	(24,857)
Net income	$ 34,970	146,409	72,547	40,128
Less: Net income attributable to non-controlling interests subsequent to initial public offering	23,332	96,354
Net income attributable to Oasis Midstream Partners LP	11,638	$ 50,055	$ 11,638
Common Units
Weighted average number of limited partners units outstanding (Note 13)
Common units- Basic (shares)		14,504	13,566
Common units - Diluted (shares)		14,519	13,568
Midstream Services
Revenues
Total revenues		$ 250,820	$ 170,178	108,366
Midstream Services | Oasis Petroleum
Revenues
Total revenues		248,216	168,205	107,772
Midstream Services | Third parties
Revenues
Total revenues		2,604	1,973	594
Product Sales
Revenues
Total revenues		20,803	12,038	12,486
Product Sales | Oasis Petroleum
Revenues
Total revenues		17,476	11,644	12,486
Product Sales | Third parties
Revenues
Total revenues		3,327	394	$ 0
General Partner
Operating expenses
Net income		112
Net income attributable to Oasis Midstream Partners LP	0	112	0
General Partner | Common Units
Operating expenses
Net income	5,819
Limited Partners
Operating expenses
Net income	0
Net income attributable to Oasis Midstream Partners LP	$ 11,638	49,943
Limited Partners | Common Units
Operating expenses
Net income		25,913
Net income attributable to Oasis Midstream Partners LP		$ 26,416	$ 5,819
Earnings per limited partner unit
Basic and Diluted (in usd per share)	$ 0.43	$ 1.82
Weighted average number of limited partners units outstanding (Note 13)
Common units- Basic (shares)	13,566	14,504
Common units - Diluted (shares)	13,568	14,519