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Derivative Instruments (Tables) | 9 Months Ended
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Sep. 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 Condensed Consolidated Balance Sheets. As of September 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 September 30, 2018 | (Dollars in thousands)
Derivatives designated as cash flow hedges: |  |  |  |  |  |
Commodity derivative contracts | Prepaid and other current assets |  | $ | 18,024 |  |  | Other accrued liabilities |  | $ | — |
| Other long-term assets |  | 23,950 |  |  | Other long-term obligations |  | — |
Total fair value |  |  | $ | 41,974 |  |  |  |  | $ | — |
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 |
The realized (gains) losses on commodity derivatives remain in Other Comprehensive Income until they are recognized in the Statements of Operations when the hedged item impacts earnings, which is when the finished product is sold. With respect to the inputs used to determine the fair value, we use observable, quoted market rates that are determined by active markets and, therefore, classify the contracts as "Level 2".
| Asset Derivatives |  | Liability Derivatives
| Location |  | Fair Value |  | Location |  | Fair Value
As of September 30, 2018 | (Dollars in Thousands)
Derivatives not designated as hedges: |  |  |  |  |  |
Foreign currency derivatives | Prepaid and other current assets |  | $ | 30 |  |  | Other current liabilities |  | $ | 9 |
As of December 31, 2017 |  |  |  |  |  |  |
Derivatives not designated as hedges: |  |  |  |  |  |
Foreign currency derivatives | Prepaid and other current assets |  | $ | 9 |  |  | Other current liabilities |  | $ | 90 |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location |
|  |  |  | Amount of (Gain)/Loss Recognized
|  | Location of (Gain)/Loss Recognized in the Consolidated Statement of Operations |  | For the Three Months Ended September 30,
|  |  | 2018 |  | 2017
Derivatives designated as cash flow hedges: |  |  |  | (Dollars in thousands)
Commodity contract hedges |  | Cost of sales |  | 421 |  |  | — |
Derivatives not designated as hedges: |  |  |  |  |  |
Foreign currency derivatives |  | Cost of sales, Other expense/(income) |  | (159 | ) |  | (266 | )
|  |  |  | Amount of (Gain)/Loss Recognized
|  | Location of (Gain)/Loss Recognized in the Consolidated Statement of Operations |  | For the Nine Months Ended September 30,
|  |  | 2018 |  | 2017
Derivatives designated as cash flow hedges: |  |  |  | (Dollars in thousands)
Commodity contract hedges |  | Cost of sales |  | $ | 421 |  |  | — |
Derivatives not designated as hedges: |  |
Foreign currency derivatives |  | Cost of sales, Other expense/(income) |  | $ | 137 |  |  | $ | (1,108 | )

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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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- Definition Tabular disclosure of derivative instruments (including nonderivative instruments that are designated and qualify as hedging instruments) of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the 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 4A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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