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Derivatives (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Offsetting Assets and Liabilities | The following tables summarize (i) the Company's commodity derivative contracts on a gross basis, (ii) the effects of netting assets and liabilities for which the right of offset exists based on master netting arrangements and (iii) for the Company’s net derivative liability positions, the applicable portion of shared collateral under the credit facility as of December 31, 2018 and 2017 (in thousands): December 31, 2018
|  | Gross Amounts |  | Gross Amounts Offset |  | Amounts Net of Offset |  | Financial Collateral |  | Net Amount
Assets |  |  |  |  |  |  |  |  |  |
Derivative contracts - current |  | $ | 5,286 |  | $ | — |  | $ | 5,286 |  | $ | — |  | $ | 5,286
Total |  | $ | 5,286 |  | $ | — |  | $ | 5,286 |  | $ | — |  | $ | 5,286
December 31, 2017
|  | Gross Amounts |  | Gross Amounts Offset |  | Amounts Net of Offset |  | Financial Collateral |  | Net Amount
Assets |  |  |  |  |  |  |  |  |  |
Derivative contracts - current |  | $ | 5,582 |  | $ | (4,272) |  | $ | 1,310 |  | $ | — |  | $ | 1,310
Total |  | $ | 5,582 |  | $ | (4,272) |  | $ | 1,310 |  | $ | — |  | $ | 1,310
Liabilities |  |  |  |  |  |  |  |  |  |
Derivative contracts - current |  | $ | 14,899 |  | $ | (4,272) |  | $ | 10,627 |  | $ | (10,627) |  | $ | —
Derivative contracts - noncurrent |  | 3,568 |  | — |  | 3,568 |  | (3,568) |  | —
Total |  | $ | 18,467 |  | $ | (4,272) |  | $ | 14,195 |  | $ | (14,195) |  | $ | —
Open Oil and Natural Gas Commodity Derivative Contracts | At December 31, 2018, the Company’s open commodity derivative contracts consisted of the following: Natural Gas Price Swaps
| Notional (MMcf) |  | Weighted Average Fixed Price
January 2019 - March 2019 | 4,500 |  | $ | 4.28
Fair Value of Derivative Contracts | The following table presents the fair value of the Company’s derivative contracts on a gross basis without regard to same-counterparty netting (in thousands):
|  |  |  | December 31, |  | December 31,
Type of Contract |  | Balance Sheet Classification |  | 2018 |  | 2017
Derivative assets |  |  |  |  |  |
Natural gas price swaps |  | Derivative contracts - current |  | $ | 5,286 |  | $ | 5,582
Derivative liabilities |  |  |  |  |  |
Oil price swaps |  | Derivative contracts - current |  | — |  | (14,899)
Oil price swaps |  | Derivative contracts - noncurrent |  | — |  | (3,568)
Total net derivative contracts |  |  |  | $ | 5,286 |  | $ | (12,885)

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Tabular disclosure of derivative and other financial assets and liabilities that are subject to offsetting, including master netting arrangements. [Table Text Block] + References No definition available. + Details
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