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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Outstanding Commodity Derivative Instruments | At December 31, 2017, the Company had the following outstanding commodity derivative instruments:
Commodity |  | Settlement Period |  | Derivative Instrument |  | Volumes |  | Weighted Average Prices |  | Fair Value Asset (Liabilities)
|  |  |  | Swap |  | Sub-Floor |  | Floor |  | Ceiling |
|  |  |  |  |  |  |  |  |  |  |  | (In thousands)
Crude oil |  | 2018 |  | Swaps |  | 13,675,000 |  |  | Bbl |  | $ | 51.25 |  |  |  |  |  |  |  |  | $ | (109,129 | )
Crude oil |  | 2018 |  | Two-way collar |  | 1,250,000 |  |  | Bbl |  |  |  |  |  | $ | 48.19 |  |  | $ | 53.33 |  |  | (7,785 | )
Crude oil |  | 2018 |  | Three-way collar |  | 186,000 |  |  | Bbl |  |  |  | $ | 31.67 |  |  | $ | 45.83 |  |  | $ | 59.94 |  |  | (107 | )
Crude oil |  | 2019 |  | Swaps |  | 4,091,000 |  |  | Bbl |  | $ | 51.52 |  |  |  |  |  |  |  |  | (18,635 | )
Crude oil |  | 2019 |  | Two-way collar |  | 93,000 |  |  | Bbl |  |  |  |  |  | $ | 48.67 |  |  | $ | 53.07 |  |  | (513 | )
Crude oil |  | 2020 |  | Swaps |  | 279,000 |  |  | Bbl |  | $ | 51.76 |  |  |  |  |  |  |  |  | (728 | )
Natural gas |  | 2018 |  | Swaps |  | 7,665,000 |  |  | MMbtu |  | $ | 3.05 |  |  |  |  |  |  |  |  | 1,683 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (135,214 | )
Realized and Unrealized Gains and Losses From Commodity Derivative Instruments | The following table summarizes the location and amounts of gains and losses from the Company’s commodity derivative instruments recorded in the Company’s Consolidated Statements of Operations for the periods presented:
|  | Year Ended December 31,
Statement of Operations Location |  | 2017 |  | 2016 |  | 2015
|  | (In thousands)
Net gain (loss) on derivative instruments |  | $ | (71,657 | ) |  | $ | (105,317 | ) |  | $ | 210,376 |
Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments | The following tables summarize the location and fair value of all outstanding commodity derivative instruments recorded in the Company’s Consolidated Balance Sheets:
|  |  |  | December 31, 2017
Commodity |  | Balance Sheet Location |  | Gross Recognized Assets/Liabilities |  | Gross Amount Offset |  | Net Recognized Fair Value Assets/Liabilities
|  |  |  | (In thousands)
Derivatives assets: |  |  |  |  |  |  |  |
Commodity contracts |  | Derivative instruments — current assets |  | $ | 344 |  |  | $ | — |  |  | $ | 344 |
Commodity contracts |  | Derivative instruments — non-current assets |  | 9 |  |  | — |  |  | 9 |
Total derivatives assets |  |  |  | $ | 353 |  |  | $ | — |  |  | $ | 353 |
Derivatives liabilities: |  |  |  |  |  |  |  |
Commodity contracts |  | Derivative instruments — current liabilities |  | $ | 117,629 |  |  | $ | (1,913 | ) |  | $ | 115,716 |
Commodity contracts |  | Derivative instruments — non-current liabilities |  | 20,035 |  |  | (184 | ) |  | 19,851 |
Total derivatives liabilities |  | $ | 137,664 |  |  | $ | (2,097 | ) |  | $ | 135,567 |
|  |  |  | December 31, 2016
Commodity |  | Balance Sheet Location |  | Gross Recognized Asset/Liabilities |  | Gross Amount Offset |  | Net Recognized Fair Value Asset/Liabilities
|  |  |  | (In thousands)
Derivatives assets: |  |  |  |  |  |  |  |
Commodity contracts |  | Derivative instruments — current assets |  | $ | 482 |  |  | $ | (120 | ) |  | $ | 362 |
Total derivatives assets |  |  |  | $ | 482 |  |  | $ | (120 | ) |  | $ | 362 |
Derivatives liabilities: |  |  |  |  |  |  |  |
Commodity contracts |  | Derivative instruments — current liabilities |  | $ | 66,838 |  |  | $ | (6,369 | ) |  | $ | 60,469 |
Commodity contracts |  | Derivative instruments — non-current liabilities |  | 14,164 |  |  | (2,450 | ) |  | 11,714 |
Total derivatives liabilities |  | $ | 81,002 |  |  | $ | (8,819 | ) |  | $ | 72,183 |

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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