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Derivatives, Hedges, Financial Instruments and Carbon Credits (Tables) | 6 Months Ended
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Jun. 30, 2014
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 June 30, 2014 and December 31, 2013:
|  |  |  |  | Fair Value Measurement at |  |  |  |
|  |  |  |  | June 30, 2014 Using |  |  |  |
Description |  | Total Fair Value At June 30, 2014 |  |  | 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, 2013 |
|  |  |  |  |  |  |  | (In Thousands) |  |  |  |  |  |  |
Assets—Supplies, prepaid items and other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodities contracts |  | $ | 124 |  |  | $ | — |  |  | $ | 124 |  |  | $ | — |  |  | $ | 31 |
Carbon credits |  |  | 1,673 |  |  |  | — |  |  |  | — |  |  |  | 1,673 |  |  |  | 1,284 |
Total |  | $ | 1,797 |  |  | $ | — |  |  | $ | 124 |  |  | $ | 1,673 |  |  | $ | 1,315 |
Liabilities—Current and noncurrent accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligations—carbon credits |  | $ | 1,673 |  |  |  | — |  |  |  | — |  |  |  | 1,673 |  |  |  | 1,284 |
Interest rate contract |  |  | 976 |  |  |  | — |  |  |  | 976 |  |  |  | — |  |  |  | 1,240 |
Total |  | $ | 2,649 |  |  | $ | — |  |  | $ | 976 |  |  | $ | 1,673 |  |  | $ | 2,524 |
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 |  |  | Assets |  |  | Liabilities |
|  | Six Months Ended |  |  | Six Months Ended |  |  | Three Months Ended |  |  | Three Months Ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
|  | (In Thousands) |
Beginning balance |  | $ | 1,284 |  |  | $ | 91 |  |  | $ | (1,284 | ) |  | $ | (91 | ) |  | $ | 1,673 |  |  | $ | 312 |  |  | $ | (1,673 | ) |  | $ | (312 | )
Transfers into Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfers out of Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total realized and unrealized gains (losses) included in earnings |  |  | 1,925 |  |  |  | 546 |  |  |  | (1,634 | ) |  |  | (546 | ) |  |  | — |  |  |  | 313 |  |  |  | — |  |  |  | (313 | )
Purchases |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Issuances |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sales |  |  | (1,536 | ) |  |  | (12 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Settlements |  |  | — |  |  |  | — |  |  |  | 1,245 |  |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Ending balance |  | $ | 1,673 |  |  | $ | 625 |  |  | $ | (1,673 | ) |  | $ | (625 | ) |  | $ | 1,673 |  |  | $ | 625 |  |  | $ | (1,673 | ) |  | $ | (625 | )
Total gains (losses) for the period included in earnings results attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date |  | $ | 1,004 |  |  | $ | 534 |  |  | $ | (1,004 | ) |  | $ | (534 | ) |  | $ | — |  |  | $ | 313 |  |  | $ | — |  |  | $ | (313 | )
Net Gains (Losses) Included in Earnings and the Income Statement Classifications | Net gains (losses) included in earnings and the income statement classifications are as follows:
|  | Six Months Ended |  |  | Three Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
|  | (In Thousands) |
Total net gains (losses) included in earnings: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales—Undesignated commodities contracts |  | $ | 2,111 |  |  | $ | (275 | ) |  | $ | (105 | ) |  | $ | (113 | )
Other income—Carbon credits |  |  | 1,925 |  |  |  | 546 |  |  |  | — |  |  |  | 313 |
Other expense—Contractual obligations relating to carbon credits |  |  | (1,634 | ) |  |  | (546 | ) |  |  | — |  |  |  | (313 | )
Interest expense—Undesignated interest rate contract |  |  | (57 | ) |  |  | 89 |  |  |  | (37 | ) |  |  | 88 |
|  | $ | 2,345 |  |  | $ | (186 | ) |  | $ | (142 | ) |  | $ | (25 | )

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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 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 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: 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=7476318&loc=SL5624171-113959 + 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=25499696&loc=d3e19190-110258 + Details
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