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Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Changes in accumulated other comprehensive income (loss) |  |  |  |  |  |
Beginning balance |  | $ 158,981 | $ 22,984 | $ 199,494 | $ 44,703 |
Gains (losses) recognized in accumulated OCI, net of tax |  |  | (13,455) |  | (52,649) |
Gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets |  |  | (16,735) |  | (16,735) |
(Gains) losses reclassified from accumulated OCI, net of tax |  | (42,343) | 11,095 | (82,856) | 28,570 |
Other comprehensive loss |  | (42,343) | (19,095) | (82,856) | (40,814) |
Ending balance |  | 116,638 | 3,889 | 116,638 | 3,889 |
Cash flow hedge, net of tax | Natural gas |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) |  |  |  |  |  |
Beginning balance |  | 176,370 | 39,768 | 217,121 | 61,699 |
Gains (losses) recognized in accumulated OCI, net of tax | [1] |  | (13,455) |  | (52,649) |
Gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets |  |  | (16,735) |  | (16,735) | [1]
(Gains) losses reclassified from accumulated OCI, net of tax | [1] | (42,581) | 10,883 | (83,332) | 28,146 |
Other comprehensive loss |  |  | (19,307) |  | (41,238) |
Ending balance |  | 133,789 | 20,461 | 133,789 | 20,461 |
Cash flow hedge, net of tax | Interest rate |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) |  |  |  |  |  |
Beginning balance |  | (951) | (1,096) | (987) | (1,132) |
Gains (losses) recognized in accumulated OCI, net of tax |  |  | 0 |  | 0 |
Gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets |  |  | 0 |  | 0 |
(Gains) losses reclassified from accumulated OCI, net of tax | [1] | 36 | 36 | 72 | 72 |
Other comprehensive loss |  |  | 36 |  | 72 |
Ending balance |  | (915) | (1,060) | (915) | (1,060) |
Pension and other post-retirement benefits liability adjustment, net of tax |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) |  |  |  |  |  |
Beginning balance |  | (16,438) | (15,688) | (16,640) | (15,864) |
Gains (losses) recognized in accumulated OCI, net of tax |  |  | 0 |  | 0 |
Gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets |  |  | 0 |  | 0 |
(Gains) losses reclassified from accumulated OCI, net of tax | [2] | 202 | 176 | 404 | 352 |
Other comprehensive loss |  |  | 176 |  | 352 |
Ending balance |  | $ (16,236) | $ (15,512) | $ (16,236) | $ (15,512) |
[1] | See Note F for additional information.
[2] | This accumulated OCI reclassification is attributable to the net actuarial loss and net prior service cost related to the Company’s defined benefit pension plans and other post-retirement benefit plans. See Note 13 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 for additional information.

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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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: 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=36458714&loc=d3e681-108580 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=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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