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Accumulated Other Comprehensive Income / (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), net of taxes: |  |  |
Balance at beginning of period | $ 104,547 | $ (3,683) | $ 42,436
Net change in unrealized gain on cash flow hedges, net of taxes | (90,641) | 110,864 | (61,378)
Net changes in defined benefit pension and postretirement plans, net of taxes | 9,974 | (2,689) | 15,227
Net changes in foreign currency translation adjustment, net of taxes |  | 55 | 32
Balance at end of period | 23,880 | 104,547 | (3,683)
Tax effect of Accumulated Other Comprehensive Income / (Loss) items: |  |  |
Net change in unrealized gain on cash flow hedges, tax effect | 56,980 | (70,463) | 35,957
Net change in defined benefit pension and postretirement plans, tax effect | (6,226) | 2,225 | (9,088)
Net changes in foreign currency translation adjustment, taxes |  | (34) | (20)
Accumulated Net Gains / (Losses) on Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss), net of taxes: |  |  |
Balance at beginning of period | 121,358 | 10,494 | 71,872
Net change in unrealized gain on cash flow hedges, net of taxes | (90,641) | 110,864 | (61,378)
Balance at end of period | 30,717 | 121,358 | 10,494
Accumulated Defined Benefit Pension and Postretirement Plans |  |  |
Accumulated Other Comprehensive Income (Loss), net of taxes: |  |  |
Balance at beginning of period | (16,811) | (14,122) | (29,349)
Net changes in defined benefit pension and postretirement plans, net of taxes | 9,974 | (2,689) | 15,227
Balance at end of period | (6,837) | (16,811) | (14,122)
Accumulated Foreign Currency Translation Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss), net of taxes: |  |  |
Balance at beginning of period |  | (55) | (87)
Net changes in foreign currency translation adjustment, net of taxes |  | 55 | 32
Balance at end of period |  |  | $ (55)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. + Details
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