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Financial Statement Presentation (Tables) | 9 Months Ended
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Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | The following table presents revenues disaggregated by product:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
OPERATING REVENUES |  |  |  |  |  |  |  |
Natural gas |  | $ | 440,835 |  |  | $ | 323,319 |  |  | $ | 1,217,603 |  |  | $ | 1,152,089 |
Crude oil and condensate |  | — |  |  | 56,913 |  |  | 48,722 |  |  | 144,528 |
Brokered natural gas |  | 105,849 |  |  | 3,528 |  |  | 203,375 |  |  | 12,260 |
Other |  | 2,026 |  |  | 2,492 |  |  | 3,775 |  |  | 8,486 |
Total revenues from contracts with customers |  | 548,710 |  |  | 386,252 |  |  | 1,473,475 |  |  | 1,317,363 |
Gain (loss) on derivative instruments |  | (3,537 | ) |  | (836 | ) |  | (1,628 | ) |  | 46,353 |
Total operating revenues |  | $ | 545,173 |  |  | $ | 385,416 |  |  | $ | 1,471,847 |  |  | $ | 1,363,716 |

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