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Derivatives, Hedges, Financial Instruments and Carbon Credits (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Assets and Liabilities Measured at Fair Value on Recurring Basis | The following details our assets and liabilities that are measured at fair value on a recurring basis at December 31, 2015 and 2014:
|  |  |  |  |  | Fair Value Measurements at December 31, 2015 Using |  |  |  |  |
Description |  | Total Fair Value at December 31, 2015 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Fair Value at December 31, 2014 |
|  | (In Thousands) |
Assets - Supplies, prepaid items and other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodities contracts (1) |  | $ | 195 |  |  | $ | — |  |  | $ | 195 |  |  | $ | — |  |  | $ | — |
Carbon credits |  |  | 1,154 |  |  |  | — |  |  |  | — |  |  |  | 1,154 |  |  |  | 2,779 |
Total |  | $ | 1,349 |  |  | $ | — |  |  | $ | 195 |  |  | $ | 1,154 |  |  | $ | 2,779 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodities contracts (1) |  | $ | 202 |  |  | $ | — |  |  | $ | 202 |  |  | $ | — |  |  | $ | 2,440 |
Contractual obligations - carbon credits |  |  | 1,154 |  |  |  | — |  |  |  | — |  |  |  | 1,154 |  |  |  | 2,779 |
Embedded derivative |  |  | 3,308 |  |  |  | — |  |  |  | 3,308 |  |  |  | — |  |  |  | — |
Interest rate contracts |  |  | 126 |  |  |  | — |  |  |  | 126 |  |  |  | — |  |  |  | 671 |
Foreign exchange contracts |  |  | 6 |  |  |  | — |  |  |  | 6 |  |  |  | — |  |  |  | 44 |
Total |  | $ | 4,796 |  |  | $ | — |  |  | $ | 3,642 |  |  | $ | 1,154 |  |  | $ | 5,934 |
(1) | The $195,000 is subject to an agreement that allows net settlement of contracts; however, we have chosen to present the fair values of our commodities contracts under master netting agreements using a gross fair value presentation.
Reconciliation of Beginning and Ending Balances for Assets and Liabilities Measured at Fair Value on Recurring Basis | the following is a reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
|  | Assets |  |  | Liabilities |
|  | 2015 |  |  | 2014 |  |  | 2013 |  |  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (In Thousands) |
Beginning balance |  | $ | 2,779 |  |  | $ | 1,284 |  |  | $ | 91 |  |  | $ | (2,779 | ) |  | $ | (1,284 | ) |  | $ | (91 | )
Transfers into Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfers out of Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total realized and unrealized gains (losses) included in operating results |  |  | 2,351 |  |  |  | 3,089 |  |  |  | 1,233 |  |  |  | (1,447 | ) |  |  | (2,799 | ) |  |  | (1,233 | )
Purchases |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Issuances |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sales |  |  | (3,976 | ) |  |  | (1,594 | ) |  |  | (40 | ) |  |  | — |  |  |  | — |  |  |  | — |
Settlements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,072 |  |  |  | 1,304 |  |  |  | 40 |
Ending balance |  | $ | 1,154 |  |  | $ | 2,779 |  |  | $ | 1,284 |  |  | $ | (1,154 | ) |  | $ | (2,779 | ) |  | $ | (1,284 | )
Total gains (losses) for the period included in operating results attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date |  | $ | 1,143 |  |  | $ | 2,110 |  |  | $ | 1,193 |  |  | $ | (1,143 | ) |  | $ | (2,110 | ) |  | $ | (1,193 | )
Net Gains (Losses) Included in Operating Results and Statement of Operations Classifications | Net gains (losses) included in operating results and the statement of operations classifications are as follows:
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (In Thousands) |
Total net gains (losses) included in operating results: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales - Undesignated commodities contracts |  | $ | (4,293 | ) |  | $ | (1,198 | ) |  | $ | (244 | )
Cost of sales - Undesignated foreign exchange contracts |  |  | (72 | ) |  |  | (49 | ) |  |  | — |
Other income - Carbon credits |  |  | 3,663 |  |  |  | 3,089 |  |  |  | 1,233 |
Other expense - Contractual obligations relating to carbon credits |  |  | (2,759 | ) |  |  | (2,799 | ) |  |  | (1,233 | )
Non-operating other expense - embedded derivative |  |  | (520 | ) |  |  | — |  |  |  | — |
Interest expense - Undesignated interest rate contracts |  |  | (47 | ) |  |  | (71 | ) |  |  | (33 | )
Total net losses included in operating results |  | $ | (4,028 | ) |  | $ | (1,028 | ) |  | $ | (277 | )
Schedule of Carrying Values and Estimated Fair Values of Financial Instruments | At December 31, 2015 and 2014, we did not have any financial instruments with fair values significantly different from their carrying amounts (which excludes issuance costs, if applicable), except for the 7.75% Senior Secured Notes as shown below
|  | 2015 |  |  | 2014 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In Thousands) |
7.75% Senior Secured Notes (1) |  | $ | 425 |  |  | $ | 355 |  |  | $ | 425 |  |  | $ | 442 |
(1) | Based on a quoted price of 83.65 at December 31, 2015 and 104 at December 31, 2014.

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- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs). + References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + 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=36462937&loc=d3e19190-110258 + Details
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