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Derivatives, Hedges, Financial Instruments and Carbon Credits (Tables) | 3 Months Ended
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Mar. 31, 2013
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 March 31, 2013 and December 31, 2012:
|  | Fair Value Measurements at March 31, 2013 Using |  |  |  |
|  |  |  |  | Quoted Prices |  |  |  |  |  |  |  |  |  |
|  |  |  |  | in Active |  |  | Significant |  |  |  |  |  |  |
|  | Total Fair |  |  | Markets for |  |  | Other |  |  | Significant |  |  | Total Fair |
|  | Value At |  |  | Identical |  |  | Observable |  |  | Unobservable |  |  | Value at |
|  | March 31, |  |  | Assets |  |  | Inputs |  |  | Inputs |  |  | December 31, |
Description |  | 2013 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | 2012 |
|  | (In Thousands) |
Assets—Supplies, prepaid items and other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodities contracts |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 79 |
Carbon credits |  |  | 312 |  |  |  | — |  |  |  | — |  |  |  | 312 |  |  |  | 91 |
Total |  | $ | 312 |  |  | $ | — |  |  | $ | — |  |  | $ | 312 |  |  | $ | 170 |
Liabilities—Current and noncurrent accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodities contracts |  | $ | 83 |  |  | $ | 83 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Contractual obligations—carbon credits |  |  | 312 |  |  |  | — |  |  |  | — |  |  |  | 312 |  |  |  | 91 |
Interest rate contracts |  |  | 1,706 |  |  |  | — |  |  |  | 1,706 |  |  |  | — |  |  |  | 1,874 |
Total |  | $ | 2,101 |  |  | $ | 83 |  |  | $ | 1,706 |  |  | $ | 312 |  |  | $ | 1,965 |
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 |
|  | Three Months Ended |  |  | Three Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
|  | (In Thousands) |
Beginning balance |  | $ | 91 |  |  | $ | 42 |  |  | $ | (91 | ) |  | $ | (42 | )
Transfers into Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfers out of Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total realized and unrealized gain (loss) included in operating results |  |  | 233 |  |  |  | — |  |  |  | (233 | ) |  |  | — |
Purchases |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Issuances |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sales |  |  | (12 | ) |  |  | — |  |  |  | — |  |  |  | — |
Settlements |  |  | — |  |  |  | — |  |  |  | 12 |  |  |  | — |
Ending balance |  | $ | 312 |  |  | $ | 42 |  |  | $ | (312 | ) |  | $ | (42 | )
Realized and Unrealized Net Gains (Losses) Included in Operating Results and Classifications Within Statement of Operations | Realized and unrealized net gains (losses) included in operating results and the classifications within the statement of operations are as follows:
|  | Three Months Ended |
|  | March 31, |
|  | 2013 |  |  | 2012 |
|  | (In Thousands) |
Total net gains (losses) included in operating results: |  |  |  |  |  |  |  |
Cost of sales—Commodities contracts |  | $ | (162 | ) |  | $ | 142 |
Other income—Carbon credits |  |  | 233 |  |  |  | — |
Other expenses—Contractual obligations relating to carbon credits |  |  | (233 | ) |  |  | — |
Interest expense—Interest rate contracts |  |  | 1 |  |  |  | (96 | )
|  | $ | (161 | ) |  | $ | 46 |
|  | Three Months Ended |
|  | March 31, |
|  | 2013 |  |  | 2012 |
|  | (In Thousands) |
Change in unrealized gains (losses) relating to contracts still held at period end: |  |  |  |  |  |  |  |
Cost of sales—Commodities contracts |  | $ | (162 | ) |  | $ | 142 |
Other income—Carbon credits |  |  | 221 |  |  |  | — |
Other expense—Contractual obligations relating to carbon credits |  |  | (221 | ) |  |  | — |
Interest expense—Interest rate contracts |  |  | 168 |  |  |  | 270 |
|  | $ | 6 |  |  | $ | 412 |

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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 gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + 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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=7578670&loc=d3e19190-110258 + Details
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