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Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The fair value of all derivatives is recorded as assets or liabilities on a gross basis in our Consolidated Balance Sheets. As of June 30, 2018 and December 31, 2017, respectively, the fair value of our derivatives and their respective balance sheet locations are presented in the following table:
| Asset Derivatives |  | Liability Derivatives
| Location |  | Fair Value |  | Location |  | Fair Value
As of June 30, 2018 | (Dollars in thousands)
Derivatives designated as cash flow hedges: |  |  |  |  |  |
Commodity derivative contracts | Prepaid and other current assets |  | $ | 15,643 |  |  | Other accrued liabilities |  | $ | — |
| Other long-term assets |  | 13,095 |  |  | Other long-term obligations |  | 58 |
Total fair value |  |  | $ | 28,738 |  |  |  |  | $ | 58 |
As of December 31, 2017 |
Derivatives designated as cash flow hedges: |  |  |  |  |  |
Commodity derivative contracts | Prepaid and other current assets |  | $ | 2,518 |  |  | Other accrued liabilities |  | $ | — |
| Other long-term assets |  | 2,808 |  |  | Other long-term obligations |  | 581 |
Total fair value |  |  | $ | 5,326 |  |  |  |  | $ | 581 |

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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://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=84234895&loc=SL5624163-113959 + Details
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