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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive 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, 2021 |  | $ | (377,446) |  |  | $ | (157,635) |  |  | $ | (16,368) |  |  | $ | (551,449) |
Other comprehensive income (loss) before reclassifications |  | 32,998 |  |  | (167) |  |  | 7,372 |  |  | 40,203 |
Amounts reclassified to net income (c) |  | 41,387 |  |  | 3,805 |  |  | 458 |  |  | 45,650 |
Other comprehensive income |  | 74,385 |  |  | 3,638 |  |  | 7,830 |  |  | 85,853 |
March 31, 2021 |  | $ | (303,061) |  |  | $ | (153,997) |  |  | $ | (8,538) |  |  | $ | (465,596) |
(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 H 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 March 31, 2021, 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 33 months (b) |  | $ | (42,201) |
Settled interest-rate swaps to be recognized over the life of the long-term, fixed-rate debt (c) |  | (186,076) |
Interest-rate swaps with future settlement dates expected to be amortized over the life of long-term debt |  | (74,784) |
Accumulated other comprehensive loss at March 31, 2021 |  | $ | (303,061) |
(a) - All amounts are presented net of tax. (b) - Based on commodity prices on March 31, 2021, we expect $47.7 million in net losses, net of tax, over the next 12 months and $5.5 million in net gains, 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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