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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2013
Fair Value Disclosures [Abstract] |
Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables set forth by level within the fair value hierarchy the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis:
| At fair value as of June 30, 2013
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Assets: |  |  |  |  |  |  |
Money market funds | $ | 36,442 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,442 |
Commodity derivative instruments (see Note 6) | — |  |  | 17,907 |  |  | — |  |  | 17,907 |
Total assets | $ | 36,442 |  |  | $ | 17,907 |  |  | $ | — |  |  | $ | 54,349 |
Liabilities: |  |  |  |  |  |  |
Commodity derivative instruments (see Note 6) | $ | — |  |  | $ | 291 |  |  | $ | — |  |  | $ | 291 |
Total liabilities | $ | — |  |  | $ | 291 |  |  | $ | — |  |  | $ | 291 |
| At fair value as of December 31, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Assets: |  |  |  |  |  |  |
Money market funds | $ | 66,387 |  |  | $ | — |  |  | $ | — |  |  | $ | 66,387 |
Commodity derivative instruments (see Note 6) | — |  |  | 23,997 |  |  | — |  |  | 23,997 |
Total assets | $ | 66,387 |  |  | $ | 23,997 |  |  | $ | — |  |  | $ | 90,384 |
Liabilities: |  |  |  |  |  |  |
Commodity derivative instruments (see Note 6) | $ | — |  |  | $ | 1,428 |  |  | $ | — |  |  | $ | 1,428 |
Total liabilities | $ | — |  |  | $ | 1,428 |  |  | $ | — |  |  | $ | 1,428 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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