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Changes in Accumulated Other Comprehensive Income by Component | 6 Months Ended
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Jun. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Changes in Accumulated Other Comprehensive Income by Component | Changes in Accumulated Other Comprehensive Income by Component The following tables explain the changes in accumulated OCI by component during the applicable period:
| Three Months Ended June 30, 2016
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI, net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of April 1, 2016 | $ | 52,338 |  |  | $ | (807 | ) |  | $ | (17,328 | ) |  | $ | 34,203 |
(Gains) losses reclassified from accumulated OCI, net of tax | (15,940 | ) | (a) | 36 |  | (a) | 9,622 |  | (b) | (6,282 | )
Accumulated OCI (loss), net of tax, as of June 30, 2016 | $ | 36,398 |  |  | $ | (771 | ) |  | $ | (7,706 | ) |  | $ | 27,921 |
| Three Months Ended June 30, 2015
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI, net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of April 1, 2015 | $ | 176,370 |  |  | $ | (951 | ) |  | $ | (16,438 | ) |  | $ | 158,981 |
(Gains) losses reclassified from accumulated OCI, net of tax | (42,581 | ) | (a) | 36 |  | (a) | 202 |  | (b) | (42,343 | )
Accumulated OCI (loss), net of tax, as of June 30, 2015 | $ | 133,789 |  |  | $ | (915 | ) |  | $ | (16,236 | ) |  | $ | 116,638 |
| Six Months Ended June 30, 2016
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI, net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of January 1, 2016 | $ | 64,762 |  |  | $ | (843 | ) |  | $ | (17,541 | ) |  | $ | 46,378 |
(Gains) losses reclassified from accumulated OCI, net of tax | (28,364 | ) | (a) | 72 |  | (a) | 9,835 |  | (b) | (18,457 | )
Accumulated OCI (loss), net of tax, as of June 30, 2016 | $ | 36,398 |  |  | $ | (771 | ) |  | $ | (7,706 | ) |  | $ | 27,921 |
| Six Months Ended June 30, 2015
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI, net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of January 1, 2015 | $ | 217,121 |  |  | $ | (987 | ) |  | $ | (16,640 | ) |  | $ | 199,494 |
(Gains) losses reclassified from accumulated OCI, net of tax | (83,332 | ) | (a) | 72 |  | (a) | 404 |  | (b) | (82,856 | )
Accumulated OCI (loss), net of tax, as of June 30, 2015 | $ | 133,789 |  |  | $ | (915 | ) |  | $ | (16,236 | ) |  | $ | 116,638 |
(a) See Note G for additional information. (b) 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 14 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 and Note M for additional information.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: 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=66004124&loc=d3e637-108580 Reference 8: 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=66004124&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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