Summarized Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Total revenues | $ 118,214 | $ 84,614 | $ 82,283 | $ 81,363 | $ 69,081 | $ 55,927 | $ 45,145 | $ 30,698 | $ 366,474 | $ 200,851 | $ 137,512 |
| Income (loss) from operations | 54,028 | 31,426 | 23,743 | 32,249 | 21,168 | 16,651 | (50,529) | (34,767) | 141,446 | (47,477) | (209,110) |
| Net income (loss) | 22,824 | 17,081 | 33,390 | 47,129 | (1,746) | 21,139 | (70,097) | (41,109) | 120,424 | (91,813) | (240,139) |
| Income (loss) available to common shares | $ 21,001 | $ 15,257 | $ 31,566 | $ 45,305 | $ (3,570) | $ 19,315 | $ (71,920) | $ (42,933) | $ 113,129 | $ (99,108) | $ (248,034) |
| Basic income (loss) per share (in dollars per share) | $ 0.10 | $ 0.08 | $ 0.16 | $ 0.23 | $ (0.02) | $ 0.14 | $ (0.61) | $ (0.51) | $ 0.56 | $ (0.78) | $ (3.77) |
| Diluted income (loss) per share (in dollars per share) | $ 0.10 | $ 0.08 | $ 0.16 | $ 0.22 | $ (0.02) | $ 0.14 | $ (0.61) | $ (0.51) | $ 0.56 | $ (0.78) | $ (3.77) |
| Write-down of oil and natural gas properties | $ 61,012 | $ 34,776 | $ 0 | $ 95,788 | $ 208,435 | ||||||
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Revenue from the sale of oil and gas during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- References No definition available.
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