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Segment Reporting (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of business segments | segment | 2 |  |
Oil and natural gas revenues | $ 291,156,000 | $ 278,340,000 | $ 367,712,000
Midstream services revenues | 5,218,000 | 1,864,000 | 1,213,000
Realized gain on derivatives | 9,286,000 | 77,094,000 | 5,022,000
Unrealized gain on derivatives | (41,238,000) | (39,265,000) | 58,302,000
Expenses | 441,589,000 | 1,124,695,000 | 251,918,000
Operating (loss) income | (177,167,000) | (806,662,000) | 180,331,000
Total Assets | 1,464,665,000 | 1,140,861,000 | 1,434,490,000
Capital expenditures | 454,360,000 | 698,437,000 | 610,372,000
Depletion, depreciation and amortization | 122,048,000 | 178,847,000 | 134,737,000
Impairment charge of net capitalized costs | 158,633,000 | 801,166,000 | 0
Carrying value of net assets sold | 31,000,000 |  |
Operating Segments [Member] | Exploration and Production Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Oil and natural gas revenues | 289,512,000 | 277,844,000 | 366,191,000
Realized gain on derivatives | 9,286,000 | 77,094,000 | 5,022,000
Unrealized gain on derivatives | (41,238,000) | (39,265,000) | 58,302,000
Expenses | 391,098,000 | 1,078,534,000 | 220,374,000
Operating (loss) income | (133,538,000) | (762,861,000) | 209,141,000
Total Assets | 1,098,525,000 | 1,000,075,000 | 1,388,261,000
Capital expenditures | 379,881,000 | 622,642,000 | 597,351,000
Depletion, depreciation and amortization | 118,400,000 | 176,700,000 | 133,100,000
Impairment charge of net capitalized costs | 158,600,000 | 801,200,000 |
Operating Segments [Member] | Midstream Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Oil and natural gas revenues | 1,644,000 | 496,000 | 1,521,000
Midstream services revenues | 18,982,000 | 11,485,000 | 4,929,000
Expenses | 8,254,000 | 5,178,000 | 2,703,000
Operating (loss) income | 12,372,000 | 6,803,000 | 3,747,000
Total Assets | 140,459,000 | 75,980,000 | 35,100,000
Capital expenditures | 67,566,000 | 75,009,000 | 12,504,000
Income (loss) attributable to noncontrolling interest | 400,000 | 300,000 | 17,000
Depletion, depreciation and amortization | 2,700,000 | 1,600,000 | 1,200,000
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Expenses | 56,001,000 | 50,604,000 | 32,557,000
Operating (loss) income | (56,001,000) | (50,604,000) | (32,557,000)
Total Assets | 225,681,000 | 64,806,000 | 11,129,000
Capital expenditures | 6,913,000 | 786,000 | 517,000
Depletion, depreciation and amortization | 900,000 | 500,000 | 400,000
Consolidation, Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Midstream services revenues | (13,764,000) | (9,621,000) | (3,716,000)
Expenses | (13,764,000) | $ (9,621,000) | $ (3,716,000)
Operating (loss) income | $ 0 |  |

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- Definition Midstream refers to those gas industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). It may be applied to the gathering, processing, transmission and storage of natural gas; including the treating of natural gas to remove impurities, along with the sale of by-products such as residue gas, natural gas liquids and condensate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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