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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured on Recurring Basis | The following tables summarize the Company’s assets and liabilities measured at fair value on a recurring basis by the fair value hierarchy (in thousands): March 31, 2018
| Fair Value Measurements |  | Netting(1) |  | Assets/Liabilities at Fair Value
| Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | — |  |  | $ | 3,040 |  |  | $ | — |  |  | $ | (3,040 | ) |  | $ | — |
| $ | — |  |  | $ | 3,040 |  |  | $ | — |  |  | $ | (3,040 | ) |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | — |  |  | $ | 28,135 |  |  | $ | — |  |  | $ | (3,040 | ) |  | $ | 25,095 |
| $ | — |  |  | $ | 28,135 |  |  | $ | — |  |  | $ | (3,040 | ) |  | $ | 25,095 |
December 31, 2017
| Fair Value Measurements |  | Netting(1) |  | Assets/Liabilities at Fair Value
| Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | — |  |  | $ | 5,582 |  |  | $ | — |  |  | $ | (4,272 | ) |  | $ | 1,310 |
Investments | 5,072 |  |  | — |  |  | — |  |  | — |  |  | 5,072 |
| $ | 5,072 |  |  | $ | 5,582 |  |  | $ | — |  |  | $ | (4,272 | ) |  | $ | 6,382 |
Liabilities |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | — |  |  | $ | 18,467 |  |  | $ | — |  |  | $ | (4,272 | ) |  | $ | 14,195 |
| $ | — |  |  | $ | 18,467 |  |  | $ | — |  |  | $ | (4,272 | ) |  | $ | 14,195 |
____________________ (1)Represents the effect of netting assets and liabilities for counterparties with which the right of offset exists.
Long-Term Debt Carrying Amount and Fair Value Table | The estimated fair values and carrying values of the Company’s long-term debt are as follows (in thousands):
| March 31, 2018 |  | December 31, 2017
| Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
Building Note | $ | — |  |  | $ | — |  |  | $ | 42,526 |  |  | $ | 37,502 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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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=66048111&loc=d3e19190-110258 + Details
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