| **Business segments (Details) - USD ($) $ in Thousands** | 3 Months Ended | 6 Months Ended |           |
|----------------------------------------------------------|----------------|----------------|-----------|
||
| **Segment Reporting Information:**                       |           |           |      |   |   |
| Revenues                                                 | $ 50,960       | $ 101,303      | $ 195,592 | $ 223,960 |   |
| Segment income (loss) before income taxes                | (76,986)       | (48,028)       | (49,201)  | (50,330) |   |
| Total Assets                                             | 2,391,617      |           | 2,391,617 |   | $ 2,340,588 |
| Oil and gas exploration and production segment           |           |           |      |   |   |
| **Segment Reporting Information:**                       |           |           |      |   |   |
| Revenues                                                 | 48,437         | 78,888         | 189,836   | 174,608 |   |
| Segment income (loss) before income taxes                | (46,425)       | 4,586          | 11,736    | 37,727 |   |
| Total Assets                                             | 2,313,625      |           | 2,313,625 |   | 2,254,751 |
| Gas marketing segment                                    |           |           |      |   |   |
| **Segment Reporting Information:**                       |           |           |      |   |   |
| Revenues                                                 | 2,523          | 22,415         | 5,756     | 49,352 |   |
| Segment income (loss) before income taxes                | (313)          | (13)           | (337)     | 54 |   |
| Total Assets                                             | 4,525          |           | 4,525     |   | 6,979 |
| Corporate and other segment                              |           |           |      |   |   |
| **Segment Reporting Information:**                       |           |           |      |   |   |
| Segment income (loss) before income taxes                | (30,248)       | $ (52,601)     | (60,600)  | $ (88,111) |   |
| Total Assets                                             | 70,593         |           | 70,593    |   | 75,984 |
| Assets Held-for-sale                                     |           |           |      |   |   |
| **Segment Reporting Information:**                       |           |           |      |   |   |
| Total Assets                                             | $ 2,874        |           | $ 2,874   |   | $ 2,874 |

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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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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.
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