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Business Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2018
Segment Reporting [Abstract] |
Summarized Financial Information of Segments | The following table summarizes financial information for the Company’s three business segments for the periods presented:
| Exploration and Production |  | Midstream Services |  | Well Services |  | Eliminations |  | Consolidated
| (In thousands)
Three months ended September 30, 2018: |
Revenues from non-affiliates | $ | 497,161 |  |  | $ | 33,025 |  |  | $ | 16,262 |  |  | $ | — |  |  | $ | 546,448 |
Inter-segment revenues | — |  |  | 42,745 |  |  | 40,177 |  |  | (82,922 | ) |  | — |
Total revenues | 497,161 |  |  | 75,770 |  |  | 56,439 |  |  | (82,922 | ) |  | 546,448 |
Operating income | 146,969 |  |  | 31,326 |  |  | 9,237 |  |  | (8,487 | ) |  | 179,045 |
Other expense | (87,594 | ) |  | (367 | ) |  | (79 | ) |  | — |  |  | (88,040 | )
Income before income taxes including non-controlling interests | $ | 59,375 |  |  | $ | 30,959 |  |  | $ | 9,158 |  |  | $ | (8,487 | ) |  | $ | 91,005 |
Three months ended September 30, 2017: |
Revenues from non-affiliates | $ | 269,843 |  |  | $ | 18,767 |  |  | $ | 16,138 |  |  | $ | — |  |  | $ | 304,748 |
Inter-segment revenues | — |  |  | 28,893 |  |  | 31,025 |  |  | (59,918 | ) |  | — |
Total revenues | 269,843 |  |  | 47,660 |  |  | 47,163 |  |  | (59,918 | ) |  | 304,748 |
Operating income | 3,484 |  |  | 25,194 |  |  | 10,802 |  |  | (7,086 | ) |  | 32,394 |
Other income (expense) | (92,319 | ) |  | (15 | ) |  | 30 |  |  | — |  |  | (92,304 | )
Income (loss) before income taxes including non-controlling interests | $ | (88,835 | ) |  | $ | 25,179 |  |  | $ | 10,832 |  |  | $ | (7,086 | ) |  | $ | (59,910 | )
Nine months ended September 30, 2018: |
Revenues from non-affiliates | $ | 1,328,994 |  |  | $ | 93,663 |  |  | $ | 46,344 |  |  | $ | — |  |  | $ | 1,469,001 |
Inter-segment revenues | — |  |  | 119,095 |  |  | 114,898 |  |  | (233,993 | ) |  | — |
Total revenues | 1,328,994 |  |  | 212,758 |  |  | 161,242 |  |  | (233,993 | ) |  | 1,469,001 |
Operating income (loss) | (53,159 | ) |  | 101,457 |  |  | 25,415 |  |  | (24,357 | ) |  | 49,356 |
Other expense | (370,311 | ) |  | (703 | ) |  | (99 | ) |  | — |  |  | (371,113 | )
Income (loss) before income taxes including non-controlling interests | $ | (423,470 | ) |  | $ | 100,754 |  |  | $ | 25,316 |  |  | $ | (24,357 | ) |  | $ | (321,757 | )
Nine months ended September 30, 2017: |
Revenues from non-affiliates | $ | 761,450 |  |  | $ | 48,939 |  |  | $ | 33,566 |  |  | $ | — |  |  | $ | 843,955 |
Inter-segment revenues | — |  |  | 76,674 |  |  | 68,028 |  |  | (144,702 | ) |  | — |
Total revenues | 761,450 |  |  | 125,613 |  |  | 101,594 |  |  | (144,702 | ) |  | 843,955 |
Operating income (loss) | (12,972 | ) |  | 69,059 |  |  | 9,161 |  |  | (7,383 | ) |  | 57,865 |
Other income (expense) | (59,027 | ) |  | (13 | ) |  | 34 |  |  | — |  |  | (59,006 | )
Income (loss) before income taxes including non-controlling interests | $ | (71,999 | ) |  | $ | 69,046 |  |  | $ | 9,195 |  |  | $ | (7,383 | ) |  | $ | (1,141 | )
At September 30, 2018: |
Property, plant and equipment, net | $ | 6,227,767 |  |  | $ | 841,797 |  |  | $ | 41,468 |  |  | $ | (210,895 | ) |  | $ | 6,900,137 |
Total assets(1) | 6,675,626 |  |  | 867,226 |  |  | 49,285 |  |  | (175,706 | ) |  | 7,416,431 |
At December 31, 2017: |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ | 5,663,323 |  |  | $ | 649,923 |  |  | $ | 46,779 |  |  | $ | (186,539 | ) |  | $ | 6,173,486 |
Total assets(1) | 6,050,255 |  |  | 663,614 |  |  | 52,800 |  |  | (151,539 | ) |  | 6,615,130 |
___________________
(1) | Intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.

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