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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) | The following table sets forth the balance in accumulated other comprehensive loss for the period indicated:
|  | Risk- Management Assets/Liabilities (a) |  | Retirement and Other Postretirement Benefit Plan Obligations (a) (b) |  | Risk- Management Assets/Liabilities of Unconsolidated Affiliates (a) |  | Accumulated Other Comprehensive Loss (a)
|  | (Thousands of dollars)
January 1, 2019 |  | $ | (64,660 | ) |  | $ | (121,785 | ) |  | $ | (1,794 | ) |  | $ | (188,239 | )
Other comprehensive loss before reclassifications |  | (199,795 | ) |  | (63 | ) |  | (10,567 | ) |  | (210,425 | )
Amounts reclassified to net income |  | (29,748 | ) |  | 7,334 |  |  | (26 | ) |  | (22,440 | )
Other comprehensive income (loss) |  | (229,543 | ) |  | 7,271 |  |  | (10,593 | ) |  | (232,865 | )
September 30, 2019 |  | $ | (294,203 | ) |  | $ | (114,514 | ) |  | $ | (12,387 | ) |  | $ | (421,104 | )
(a) - All amounts are presented net of tax. (b) - Includes amounts related to supplemental executive retirement plan.
Reclassification out of Accumulated Other Comprehensive Income (Loss) | The following table sets forth the effect of reclassifications from accumulated other comprehensive loss to net income for the periods indicated:
Details about Accumulated Other Comprehensive Loss Components |  | Three Months Ended |  | Nine Months Ended |  | Affected Line Item in the Consolidated Statements of Income
| September 30, |  | September 30, |
| 2019 |  | 2018 |  | 2019 |  | 2018 |
|  | (Thousands of dollars) |  |
Risk-management assets/liabilities |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 18,528 |  |  | $ | (20,630 | ) |  | $ | 52,624 |  |  | $ | (42,430 | ) |  | Commodity sales revenues/cost of sales and fuel
Interest-rate contracts |  | (6,903 | ) |  | (4,383 | ) |  | (14,222 | ) |  | (13,929 | ) |  | Interest expense
|  | 11,625 |  |  | (25,013 | ) |  | 38,402 |  |  | (56,359 | ) |  | Income before income taxes
|  | (2,673 | ) |  | 5,752 |  |  | (8,654 | ) |  | 12,962 |  |  | Income taxes
|  | $ | 8,952 |  |  | $ | (19,261 | ) |  | $ | 29,748 |  |  | $ | (43,397 | ) |  | Net income
Retirement and other postretirement benefit plan obligations (a) |  |  |  |  |  |  |  |  |  |
Amortization of net loss |  | $ | (3,232 | ) |  | $ | (4,592 | ) |  | $ | (9,696 | ) |  | $ | (13,776 | ) |  | Other income (expense)
Amortization of unrecognized prior service credit |  | 57 |  |  | 415 |  |  | 171 |  |  | 1,245 |  |  | Other income (expense)
|  | (3,175 | ) |  | (4,177 | ) |  | (9,525 | ) |  | (12,531 | ) |  | Income before income taxes
|  | 731 |  |  | 961 |  |  | 2,191 |  |  | 2,882 |  |  | Income taxes
|  | $ | (2,444 | ) |  | $ | (3,216 | ) |  | $ | (7,334 | ) |  | $ | (9,649 | ) |  | Net income
Risk-management assets/liabilities of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |
Interest-rate contracts |  | $ | (59 | ) |  | $ | 52 |  |  | $ | 34 |  |  | $ | 71 |  |  | Equity in net earnings from investments
|  | 13 |  |  | (12 | ) |  | (8 | ) |  | (16 | ) |  | Income taxes
|  | $ | (46 | ) |  | $ | 40 |  |  | $ | 26 |  |  | $ | 55 |  |  | Net income
Total reclassifications for the period |  | $ | 6,462 |  |  | $ | (22,437 | ) |  | $ | 22,440 |  |  | $ | (52,991 | ) |  | Net income
(a) - These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note H for additional detail of our net periodic benefit cost.
Schedule of Accumulated Other Comprehensive Income (Loss) for Risk-Management Assets/Liabilities [Table Text Block] | The following table sets forth information about the balance of accumulated other comprehensive loss at September 30, 2019, representing unrealized gains (losses) related to risk-management assets and liabilities:
|  | Risk- Management Assets/Liabilities (a)
|  | (Thousands of dollars)
Commodity derivative instruments expected to be realized within the next 27 months (b) |  | $ | 30,258 |
Settled interest-rate swaps to be recognized over the life of the long-term, fixed-rate debt (c) |  | (111,275 | )
Interest-rate swaps with future settlement dates expected to be amortized over the life of long-term debt |  | (213,186 | )
Accumulated other comprehensive loss at September 30, 2019 |  | $ | (294,203 | )
(a) - All amounts are presented net of tax. (b) - Based on September 30, 2019, commodity prices, we will realize $27.9 million in net gains, net of tax, over the next 12 months and $2.4 million in net gains, net of tax, thereafter. (c) - Losses of $19.7 million, net of tax, will be reclassified into earnings during the next 12 months as the hedged items affect earnings.

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- Definition [Table Text Block] for Tabular disclosure of the risk-management assets/liabilities component of other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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