XML 38 R27.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Revenue Recognition (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Exploration and Production [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenues associated with contracts with customers for oil, natural gas and NGL sales were as follows for the three and nine months ended September 30, 2018 and 2017:
Exploration and Production Revenues
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Oil revenues | $ | 412,530 |  |  | $ | 221,003 |  |  | $ | 1,097,171 |  |  | $ | 623,603 |
Purchased oil sales | 42,902 |  |  | 20,734 |  |  | 114,598 |  |  | 56,269 |
Natural gas revenues | 26,181 |  |  | 17,037 |  |  | 76,201 |  |  | 51,689 |
Purchased gas sales | 1,616 |  |  | 462 |  |  | 2,161 |  |  | 648 |
NGL revenues | 13,932 |  |  | 10,607 |  |  | 38,863 |  |  | 29,241 |
Total exploration and production revenues | $ | 497,161 |  |  | $ | 269,843 |  |  | $ | 1,328,994 |  |  | $ | 761,450 |
Midstream Services [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenues associated with contracts with customers for midstream services were as follows for the three and nine months ended September 30, 2018 and 2017:
Midstream Revenues(1)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Crude oil and natural gas revenues | $ | 18,188 |  |  | $ | 11,612 |  |  | $ | 54,124 |  |  | $ | 23,348 |
Purchased oil sales | 1,838 |  |  | — |  |  | 5,212 |  |  | — |
Water revenues | 12,999 |  |  | 7,155 |  |  | 34,327 |  |  | 25,591 |
Total midstream revenues | $ | 33,025 |  |  | $ | 18,767 |  |  | $ | 93,663 |  |  | $ | 48,939 |
__________________
(1) | Represents midstream revenues, excluding all intercompany revenues, for work performed by the midstream services business segment for the Company’s working interests that are eliminated in consolidation and are therefore not included in midstream services revenues.
Well Services [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenues associated with contracts with customers for hydraulic fracturing services and equipment rental sales were as follows for the three and nine months ended September 30, 2018 and 2017:
Well Services Revenues(1)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Hydraulic fracturing service revenues | $ | 14,985 |  |  | $ | 15,090 |  |  | $ | 42,801 |  |  | $ | 31,303 |
Equipment rental revenues | 1,277 |  |  | 1,048 |  |  | 3,543 |  |  | 2,263 |
Total well services revenues | $ | 16,262 |  |  | $ | 16,138 |  |  | $ | 46,344 |  |  | $ | 33,566 |
__________________
(1) | Represents well services revenues excluding all intercompany revenues for work performed by the well services business segment for the Company’s working interests that are eliminated in consolidation and are therefore not included in well services revenues.

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_DisaggregationOfRevenueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=oas_ExplorationAndProductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=oas_MidstreamServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=oas_WellServicingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |