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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Loss | The following table sets forth the balance in accumulated other comprehensive loss for the periods 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 |  | (147,803) |  |  | (19,490) |  |  | (7,275) |  |  | (174,568) |
Amounts reclassified to net income (c) |  | (21,057) |  |  | 9,794 |  |  | 70 |  |  | (11,193) |
Other comprehensive loss |  | (168,860) |  |  | (9,696) |  |  | (7,205) |  |  | (185,761) |
December 31, 2019 |  | (233,520) |  |  | (131,481) |  |  | (8,999) |  |  | (374,000) |
Other comprehensive loss before reclassifications |  | (165,023) |  |  | (40,341) |  |  | (8,635) |  |  | (213,999) |
Amounts reclassified to net income (c) |  | 21,097 |  |  | 14,187 |  |  | 1,266 |  |  | 36,550 |
Other comprehensive loss |  | (143,926) |  |  | (26,154) |  |  | (7,369) |  |  | (177,449) |
December 31, 2020 |  | $ | (377,446) |  |  | $ | (157,635) |  |  | $ | (16,368) |  |  | $ | (551,449) |
(a) - All amounts are presented net of tax. (b) - Includes amounts related to supplemental executive retirement plan. (c) - See Note C for details of amounts reclassified to net income for risk-management assets/liabilities and Note K for retirement and other postretirement benefit plan obligations.
Schedule of Accumulated Other Comprehensive Loss for Risk-Management Assets/Liabilities [Table Text Block] | The following table sets forth information about the balance of accumulated other comprehensive loss at December 31, 2020, 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 24 months (b) |  | $ | (27,303) |
Settled interest-rate swaps to be recognized over the life of the long-term, fixed-rate debt (c) |  | (193,519) |
Interest-rate swaps with future settlement dates expected to be amortized over the life of long-term debt |  | (156,624) |
Accumulated other comprehensive loss at December 31, 2020 |  | $ | (377,446) |
(a) - All amounts are presented net of tax. (b) - Based on December 31, 2020, commodity prices, we expect $27.0 million in net losses, net of tax, over the next 12 months and $0.3 million in net losses, net of tax, thereafter. (c) - We expect net losses of $30.5 million, net of tax, will be reclassified into earnings during the next 12 months.

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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 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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