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Changes in Accumulated Other Comprehensive Income by Component (Tables) | 3 Months Ended
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Mar. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of the changes in accumulated OCI by component | The following tables explain the changes in accumulated OCI by component during the applicable period:
| Three Months Ended March 31, 2017
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Other post- retirement benefit liability adjustment, net of tax |  | Accumulated OCI, net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of January 1, 2017 | $ | 9,607 |  |  | $ | (699 | ) |  | $ | (6,866 | ) |  | $ | 2,042 |
(Gains) losses reclassified from accumulated OCI, net of tax | (888 | ) | (a) | 36 |  | (a) | 76 |  | (b) | (776 | )
Accumulated OCI (loss), net of tax, as of March 31, 2017 | $ | 8,719 |  |  | $ | (663 | ) |  | $ | (6,790 | ) |  | $ | 1,266 |
| Three Months Ended March 31, 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 | (12,424 | ) | (a) | 36 |  | (a) | 213 |  | (b) | (12,175 | )
Accumulated OCI (loss), net of tax, as of March 31, 2016 | $ | 52,338 |  |  | $ | (807 | ) |  | $ | (17,328 | ) |  | $ | 34,203 |
(a) See Note G for additional information. (b) The accumulated OCI reclassification for the three months ended March 31, 2017 is attributable to the net actuarial loss and net prior service cost related to the Company’s post-retirement benefit plans other than its defined benefit pension plans. The accumulated OCI reclassification for the three months ended March 31, 2016 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 15 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 for additional information.

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- References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=66004124&loc=SL7669686-108580 + Details
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