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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Outstanding Commodity Derivative Instruments | As of December 31, 2013, the Company had the following outstanding commodity derivative instruments, all of which settle monthly based on the WTI crude oil index price:
Settlement Period |  | Derivative Instrument |  | Total Notional Amount of Oil |  | Weighted Average Prices |  | Fair Value Asset (Liability)
|  |  | Swap |  | Sub-Floor |  | Floor |  | Ceiling |
|  |  |  | (Barrels) |  | ($/Barrel) |  | (In thousands)
2014 |  | Two-way collars |  | 1,510,000 |  |  |  |  |  |  |  | $ | 90.77 |  |  | $ | 102.06 |  |  | $ | 302 |
2014 |  | Three-way collars |  | 3,530,530 |  |  |  |  | $ | 70.30 |  |  | $ | 90.65 |  |  | $ | 105.64 |  |  | 2,927 |
2014 |  | Put spreads |  | 11,470 |  |  |  |  |  | $ | 70.00 |  |  | $ | 90.00 |  |  |  |  |  | — |
2014 |  | Swaps |  | 2,218,500 |  |  | $ | 95.87 |  |  |  |  |  |  |  |  |  |  |  | (2,042 | )
2014 |  | Swaps with subfloors |  | 2,004,000 |  |  | $ | 92.60 |  |  | $ | 70.00 |  |  |  |  |  |  |  |  | (7,111 | )
2015 |  | Two-way collars |  | 108,500 |  |  |  |  |  |  |  | $ | 90.00 |  |  | $ | 99.86 |  |  | 275 |
2015 |  | Three-way collars |  | 263,500 |  |  |  |  | $ | 70.59 |  |  | $ | 90.59 |  |  | $ | 105.25 |  |  | 777 |
2015 |  | Swaps |  | 108,500 |  |  | $ | 93.07 |  |  |  |  |  |  |  |  |  |  |  | 148 |
2015 |  | Swaps with subfloors |  | 186,000 |  |  | $ | 92.60 |  |  | $ | 70.00 |  |  |  |  |  |  |  |  | (6 | )
|  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (4,730 | )
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 Consolidated Balance Sheet for the periods presented:
Fair Value of Derivative Instrument Assets (Liabilities)
|  |  |  | Fair Value December 31,
Commodity |  | Balance Sheet Location |  | 2013 |  | 2012
|  |  |  | (In thousands)
Crude oil |  | Derivative instruments — current assets |  | $ | 2,264 |  |  | $ | 19,016 |
Crude oil |  | Derivative instruments — non-current assets |  | 1,333 |  |  | 4,981 |
Crude oil |  | Derivative instruments — current liabilities |  | (8,188 | ) |  | (1,048 | )
Crude oil |  | Derivative instruments — non-current liabilities |  | (139 | ) |  | (380 | )
Total derivative instruments |  |  |  | $ | (4,730 | ) |  | $ | 22,569 |
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 for the periods presented:
|  |  | December 31,
| Statement of Operations Location |  | 2013 |  | 2012 |  | 2011
|  |  | (In thousands)
Change in fair value of derivative instruments | Net gain (loss) on derivative instruments |  | $ | (27,299 | ) |  | $ | 27,619 |  |  | $ | 5,436 |
Derivative settlements | Net gain (loss) on derivative instruments |  | (8,133 | ) |  | 6,545 |  |  | (3,841 | )
Total net gain (loss) on derivative instruments |  |  | $ | (35,432 | ) |  | $ | 34,164 |  |  | $ | 1,595 |
Offsetting Assets | 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, 2013 |  | $ | 22,743 |  |  | $ | (19,146 | ) |  | $ | 3,597 |
As of December 31, 2012 |  | $ | 68,970 |  |  | $ | (44,973 | ) |  | $ | 23,997 |
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, 2013 |  | $ | 27,473 |  |  | $ | (19,146 | ) |  | $ | 8,327 |
As of December 31, 2012 |  | $ | 46,401 |  |  | $ | (44,973 | ) |  | $ | 1,428 |

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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 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: 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=7476318&loc=d3e41678-113959 Reference 3: 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=7476318&loc=d3e41620-113959 Reference 4: 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=7476318&loc=SL5579245-113959 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=7476318&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 1 -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579240-113959 Reference 7: 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=7476318&loc=d3e41641-113959 Reference 8: 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=7476318&loc=d3e41638-113959 Reference 9: 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=7476318&loc=SL5624171-113959 Reference 10: 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=7476318&loc=SL5624163-113959 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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