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Changes in Accumulated Other Comprehensive Income by Component | 9 Months Ended
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Sep. 30, 2018
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 other comprehensive income (OCI) by component during the applicable period:
| Three Months Ended September 30, 2018
| 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 July 1, 2018 | $ | 3,872 |  |  | $ | (475 | ) |  | $ | (6,356 | ) |  | $ | (2,959 | )
(Gains) losses reclassified from accumulated OCI, net of tax | (430 | ) | (a) | 52 |  | (a) | 86 |  | (b) | (292 | )
Accumulated OCI (loss), net of tax, as of September 30, 2018 | $ | 3,442 |  |  | $ | (423 | ) |  | $ | (6,270 | ) |  | $ | (3,251 | )
| Three Months Ended September 30, 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 July 1, 2017 | $ | 7,047 |  |  | $ | (627 | ) |  | $ | (6,713 | ) |  | $ | (293 | )
(Gains) losses reclassified from accumulated OCI, net of tax | (1,451 | ) | (a) | 36 |  | (a) | 77 |  | (b) | (1,338 | )
Accumulated OCI (loss), net of tax, as of September 30, 2017 | $ | 5,596 |  |  | $ | (591 | ) |  | $ | (6,636 | ) |  | $ | (1,631 | )
| Nine Months Ended September 30, 2018
| 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, 2018 | $ | 4,625 |  |  | $ | (555 | ) |  | $ | (6,528 | ) |  | $ | (2,458 | )
(Gains) losses reclassified from accumulated OCI, net of tax | (1,183 | ) | (a) | 132 |  | (a) | 258 |  | (b) | (793 | )
Accumulated OCI (loss), net of tax, as of September 30, 2018 | $ | 3,442 |  |  | $ | (423 | ) |  | $ | (6,270 | ) |  | $ | (3,251 | )
| Nine Months Ended September 30, 2017
| 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, 2017 | $ | 9,607 |  |  | $ | (699 | ) |  | $ | (6,866 | ) |  | $ | 2,042 |
(Gains) losses reclassified from accumulated OCI, net of tax | (4,011 | ) | (a) | 108 |  | (a) | 230 |  | (b) | (3,673 | )
Accumulated OCI (loss), net of tax, as of September 30, 2017 | $ | 5,596 |  |  | $ | (591 | ) |  | $ | (6,636 | ) |  | $ | (1,631 | )
(a) (Gains) losses reclassified from accumulated OCI, net of tax related to natural gas cash flow hedges were reclassified into operating revenues. Losses from accumulated OCI, net of tax related to interest rate cash flow hedges were reclassified into interest expense. (b) The accumulated OCI reclassification is attributable to the net actuarial loss and net prior service cost related to the Company’s post-retirement benefit plans. See Note 1 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for additional information.

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- References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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