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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Outstanding Commodity Derivative Instruments | As of December 31, 2015, the Company had the following outstanding commodity derivative instruments, all of which settle monthly based on the NYMEX West Texas Intermediate crude oil index price (“WTI”):
Settlement Period |  | Derivative Instrument |  | Total Notional Amount of Oil |  | Weighted Average Prices |  | Fair Value Asset (Liability)
|  |  | Swap |  | Floor |  | Ceiling |
|  |  |  | (Barrels) |  | ($/Barrel) |  | (In thousands)
2016 |  | Two-way collars |  | 155,000 |  |  |  |  | $ | 86.00 |  |  | $ | 103.42 |  |  | 7,464 |
2016 |  | Swaps |  | 9,452,000 |  |  | $ | 54.89 |  |  |  |  |  |  | 132,233 |
2017 |  | Swaps |  | 2,049,000 |  |  | $ | 53.17 |  |  |  |  |  |  | 15,109 |
2018 |  | Swaps |  | 124,000 |  |  | $ | 53.62 |  |  |  |  |  |  | 667 |
|  |  |  |  |  |  |  |  |  |  |  | $ | 155,473 |
Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments | The following table summarizes the location and fair value of all outstanding commodity derivative instruments recorded in the Company’s Consolidated Balance Sheet for the periods presented:
|  |  |  | Fair Value as of December 31,
Commodity |  | Balance Sheet Location |  | 2015 |  | 2014
|  |  |  | (In thousands)
Crude oil |  | Derivative instruments — current assets |  | $ | 139,697 |  |  | $ | 302,159 |
Crude oil |  | Derivative instruments — non-current assets |  | 15,776 |  |  | 13,348 |
Total derivative instruments |  |  |  | $ | 155,473 |  |  | $ | 315,507 |
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 Statement of Operations for the periods presented:
|  | Year Ended December 31,
Statement of Operations Location |  | 2015 |  | 2014 |  | 2013
|  | (In thousands)
Net gain (loss) on derivative instruments |  | $ | 210,376 |  |  | $ | 327,011 |  |  | $ | (35,432 | )
Offsetting Derivative Assets and Liabilities | The following tables summarize gross and net information about the Company’s commodity derivative instruments for the periods presented:
Offsetting of Derivative Assets |  | Gross Amounts of Recognized Assets |  | Gross Amounts Offset in the Balance Sheet |  | Net Amounts of Assets Presented in the Balance Sheet
|  | (In thousands)
As of December 31, 2015 |  | $ | 155,473 |  |  | $ | — |  |  | $ | 155,473 |
As of December 31, 2014 |  | $ | 331,121 |  |  | $ | (15,614 | ) |  | $ | 315,507 |
Offsetting of Derivative Liabilities |  | Gross Amounts of Recognized Liabilities |  | Gross Amounts Offset in the Balance Sheet |  | Net Amounts of Liabilities Presented in the Balance Sheet
|  | (In thousands)
As of December 31, 2015 |  | $ | — |  |  | $ | — |  |  | $ | — |
As of December 31, 2014 |  | $ | 15,614 |  |  | $ | (15,614 | ) |  | $ | — |

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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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 9: 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=56946850&loc=SL5579240-113959 Reference 10: 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=56946850&loc=d3e41620-113959 Reference 11: 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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