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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) | The following table sets forth the balance in accumulated other comprehensive loss for the period indicated:
|  | Unrealized Gains (Losses) on Risk- Management Assets/Liabilities (a) |  | Pension and Postretirement Benefit Plan Obligations (a) (b) |  | Unrealized Gains (Losses) on Risk- Management Assets/Liabilities of Unconsolidated Affiliates (a) |  | Accumulated Other Comprehensive Loss (a)
|  | (Thousands of dollars)
January 1, 2018 |  | $ | (81,915 | ) |  | $ | (105,411 | ) |  | $ | (1,204 | ) |  | $ | (188,530 | )
Other comprehensive income (loss) before reclassifications |  | 10,729 |  |  | (563 | ) |  | 5,336 |  |  | 15,502 |
Amounts reclassified from accumulated other comprehensive loss |  | 43,397 |  |  | 9,649 |  |  | (55 | ) |  | 52,991 |
Net current-period other comprehensive income (loss) attributable to ONEOK |  | 54,126 |  |  | 9,086 |  |  | 5,281 |  |  | 68,493 |
Impact of adoption of ASU 2018-02 (c) |  | (17,935 | ) |  | (20,166 | ) |  | — |  |  | (38,101 | )
September 30, 2018 |  | $ | (45,724 | ) |  | $ | (116,491 | ) |  | $ | 4,077 |  |  | $ | (158,138 | )
(a) - All amounts are presented net of tax. (b) - Includes amounts related to supplemental executive retirement plan. (c) - We elected to adopt this guidance in the first quarter 2018, which allows a reclassification from accumulated other comprehensive income/loss to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act. After adopting and applying this guidance, our accumulated other comprehensive loss balance does not include stranded taxes resulting from the Tax Cuts and Jobs Act.
Reclassification out of Accumulated Other Comprehensive Income (Loss) | The following table sets forth the effect of reclassifications from accumulated other comprehensive loss in our Consolidated Statements of 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, |
| 2018 |  | 2017 |  | 2018 |  | 2017 |
|  | (Thousands of dollars) |  |
Risk-management assets/liabilities |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (20,630 | ) |  | $ | (15,913 | ) |  | $ | (42,430 | ) |  | $ | (38,028 | ) |  | Commodity sales revenues
Interest-rate contracts |  | (4,383 | ) |  | (4,820 | ) |  | (13,929 | ) |  | (15,321 | ) |  | Interest expense
|  | (25,013 | ) |  | (20,733 | ) |  | (56,359 | ) |  | (53,349 | ) |  | Income before income taxes
|  | 5,752 |  |  | 7,671 |  |  | 12,962 |  |  | 13,077 |  |  | Income taxes
|  | (19,261 | ) |  | (13,062 | ) |  | (43,397 | ) |  | (40,272 | ) |  | Net income
Noncontrolling interests |  | — |  |  | — |  |  | — |  |  | (18,146 | ) |  | Less: Net income attributable to noncontrolling interests
|  | $ | (19,261 | ) |  | $ | (13,062 | ) |  | $ | (43,397 | ) |  | $ | (22,126 | ) |  | Net income attributable to ONEOK
Pension and postretirement benefit plan obligations (a) |  |  |  |  |  |  |  |  |  |
Amortization of net loss |  | $ | (4,592 | ) |  | $ | (3,811 | ) |  | $ | (13,776 | ) |  | $ | (11,435 | ) |  | Other income (expense)
Amortization of unrecognized prior service credit |  | 415 |  |  | 415 |  |  | 1,245 |  |  | 1,245 |  |  | Other income (expense)
|  | (4,177 | ) |  | (3,396 | ) |  | (12,531 | ) |  | (10,190 | ) |  | Income before income taxes
|  | 961 |  |  | 1,358 |  |  | 2,882 |  |  | 4,076 |  |  | Income taxes
|  | $ | (3,216 | ) |  | $ | (2,038 | ) |  | $ | (9,649 | ) |  | $ | (6,114 | ) |  | Net income attributable to ONEOK
Risk-management assets/liabilities of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |
|  | $ | 52 |  |  | $ | (83 | ) |  | $ | 71 |  |  | $ | (264 | ) |  | Equity in net earnings from investments
|  | (12 | ) |  | 31 |  |  | (16 | ) |  | 59 |  |  | Income taxes
|  | 40 |  |  | (52 | ) |  | 55 |  |  | (205 | ) |  | Net income
Noncontrolling interests |  | — |  |  | — |  |  | — |  |  | (106 | ) |  | Less: Net income attributable to noncontrolling interests
|  | $ | 40 |  |  | $ | (52 | ) |  | $ | 55 |  |  | $ | (99 | ) |  | Net income attributable to ONEOK
Total reclassifications for the period attributable to ONEOK |  | $ | (22,437 | ) |  | $ | (15,152 | ) |  | $ | (52,991 | ) |  | $ | (28,339 | ) |  | Net income attributable to ONEOK
(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.

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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://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=84228862&loc=SL7669686-108580 + Details
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