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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2019
Disaggregation of Revenue [Line Items] |
Remaining Performance Obligation Expected Satisfaction Period | The following table presents estimated revenue allocated to remaining performance obligations for contracted revenues that are unsatisfied (or partially satisfied) as of June 30, 2019:
| (In thousands)
2019 (excluding the six months ended June 30, 2019) | $ | 11,189
2020 | 24,183
2021 | 27,035
2022 | 19,262
2023 | 12,642
Thereafter | 14,642
Total | $ | 108,953
Exploration and Production Revenues |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenues associated with contracts with customers for crude oil, natural gas and natural gas liquids (“NGL”) sales were as follows for the three and six months ended June 30, 2019 and 2018:
Exploration and Production Revenues |  |  |  |  |  |  |
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands) |  |  |  |  |  |
Crude oil revenues | $ | 327,977 |  | $ | 363,182 |  | $ | 646,098 |  | $ | 689,492
Purchased crude oil sales | 106,441 |  | 127,212 |  | 253,577 |  | 194,872
Natural gas revenues | 9,734 |  | 23,059 |  | 41,330 |  | 50,021
Purchased natural gas sales | 2,920 |  | 496 |  | 4,255 |  | 545
NGL revenues | 19,293 |  | 11,608 |  | 38,358 |  | 24,931
Total exploration and production revenues | $ | 466,365 |  | $ | 525,557 |  | $ | 983,618 |  | $ | 959,861
Midstream Services |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenues associated with contracts with customers for midstream services under fee-based arrangements and midstream product sales from purchase arrangements were as follows for the three and six months ended June 30, 2019 and 2018:
Midstream Revenues(1) |  |  |  |  |  |  |
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands) |  |  |  |  |  |
Midstream service revenues |  |  |  |  |  |  |
Crude oil and natural gas revenues | $ | 22,875 |  | $ | 17,907 |  | $ | 47,538 |  | $ | 35,936
Produced and flowback water revenues | 9,473 |  | 9,058 |  | 18,506 |  | 17,934
Total midstream service revenues | $ | 32,348 |  | $ | 26,965 |  | $ | 66,044 |  | $ | 53,870
Midstream product revenues |  |  |  |  |  |  |
Purchased crude oil sales | $ | 28 |  | $ | 356 |  | $ | 28 |  | $ | 356
Natural gas and NGL revenues | 17,319 |  | — |  | 30,116 |  | —
Freshwater revenues | 1,906 |  | 2,377 |  | 3,434 |  | 3,394
Total midstream product revenues | $ | 19,253 |  | $ | 2,733 |  | $ | 33,578 |  | $ | 3,750
Total midstream revenues | $ | 51,601 |  | $ | 29,698 |  | $ | 99,622 |  | $ | 57,620
__________________ (1)Represents midstream revenues, excluding all intercompany revenues for work performed by the midstream services business segment for the Company’s ownership interests that are eliminated in consolidation and are therefore not included in consolidated midstream services revenues.
Well Services |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenues associated with contracts with customers for well services were as follows for the three and six months ended June 30, 2019 and 2018:
Well Services Revenues(1) |  |  |  |  |  |  |
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands) |  |  |  |  |  |
Hydraulic fracturing revenues | $ | 10,628 |  | $ | 17,390 |  | $ | 20,403 |  | $ | 27,816
Equipment rental revenues | 811 |  | 1,106 |  | 1,494 |  | 2,266
Total well services revenues | $ | 11,439 |  | $ | 18,496 |  | $ | 21,897 |  | $ | 30,082
__________________ (1)Represents well services revenues, excluding all intercompany revenues for work performed by the well services business segment for the Company’s ownership interests that are eliminated in consolidation and are therefore not included in consolidated well services revenues.

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