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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Revenues associated with contracts with customers for hydraulic fracturing services and equipment rental sales were as follows for the years ended December 31, 2018, 2017 and 2016:
Well Services Revenues(1)
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
Hydraulic fracturing service revenues | $ | 56,620 |  |  | $ | 49,266 |  |  | $ | 30,965 |
Equipment rental revenues | 4,455 |  |  | 3,525 |  |  | 2,789 |
Total well services revenues | $ | 61,075 |  |  | $ | 52,791 |  |  | $ | 33,754 |
__________________
(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.
Revenues associated with contracts with customers for oil, natural gas and NGL sales were as follows for the years ended December 31, 2018, 2017 and 2016:
Exploration and Production Revenues
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
Oil revenues | $ | 1,425,409 |  |  | $ | 912,806 |  |  | $ | 586,308 |
Purchased oil sales | 540,633 |  |  | 132,331 |  |  | 10,272 |
Natural gas revenues | 113,095 |  |  | 79,823 |  |  | 33,988 |
Purchased gas sales | 6,078 |  |  | 1,211 |  |  | — |
NGL revenues | 51,520 |  |  | 42,005 |  |  | 4,937 |
Total exploration and production revenues | $ | 2,136,735 |  |  | $ | 1,168,176 |  |  | $ | 635,505 |
Revenues associated with contracts with customers for midstream services were as follows for the years ended December 31, 2018, 2017 and 2016:
Midstream Revenues(1)
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
Crude oil and natural gas revenues | $ | 73,028 |  |  | $ | 37,369 |  |  | $ | 5,186 |
Purchased oil sales | 3,633 |  |  | — |  |  | — |
Purchased gas sales | 1,464 |  |  | — |  |  | — |
Water revenues | 46,012 |  |  | 35,383 |  |  | 30,220 |
Total midstream revenues | $ | 124,137 |  |  | $ | 72,752 |  |  | $ | 35,406 |
__________________
(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.
Estimated Revenue Satisfaction Period Related to Remaining Performance Obligations | The following table presents estimated revenue allocated to remaining performance obligations for contracted revenues that are unsatisfied (or partially satisfied) as of December 31, 2018:
| (In thousands)
2019 | $ | 24,879 |
2020 | 26,909 |
2021 | 25,656 |
2022 | 19,263 |
2023 | 12,642 |
Thereafter | 14,642 |
Total | $ | 123,991 |

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