| Accumulated other comprehensive income (loss) |
The following table sets forth the balance in accumulated other comprehensive loss for the periods indicated: | | | | | | | | | | | | | | | | | | | | | | Unrealized Gains (Losses) on Risk-Management Assets/Liabilities (a) | | Unrealized Holding Gains (Losses) on Investment Securities (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, 2015 | $ | (37,349 | ) | | $ | 955 |
| | $ | (99,959 | ) | | $ | — |
| | $ | (136,353 | ) | Other comprehensive income (loss) before reclassifications | 10,444 |
| | (955 | ) | | 5,722 |
| | (500 | ) | | 14,711 |
| Amounts reclassified from accumulated other comprehensive loss | (15,294 | ) | | — |
| | 9,694 |
| | — |
| | (5,600 | ) | Other comprehensive income (loss) attributable to ONEOK | (4,850 | ) | | (955 | ) | | 15,416 |
| | (500 | ) | | 9,111 |
| December 31, 2015 | (42,199 | ) | | — |
| | (84,543 | ) | | (500 | ) | | (127,242 | ) | Other comprehensive income (loss) before reclassifications | (9,280 | ) | | — |
| | (22,903 | ) | | (475 | ) | | (32,658 | ) | Amounts reclassified from accumulated other comprehensive loss | (676 | ) | | — |
| | 6,210 |
| | 16 |
| | 5,550 |
| Other comprehensive income (loss) attributable to ONEOK | (9,956 | ) | | — |
| | (16,693 | ) | | (459 | ) | | (27,108 | ) | December 31, 2016 | $ | (52,155 | ) | | $ | — |
| | $ | (101,236 | ) | | $ | (959 | ) | | $ | (154,350 | ) |
(a) All amounts are presented net of tax. (b) Includes amounts related to supplemental executive retirement plan. |
| Reclassification out of Accumulated Other Comprehensive Income |
The following table sets forth the effect of reclassifications from accumulated other comprehensive loss on our Consolidated Statements of Income for the periods indicated: | | | | | | | | | | | | | | | | Details about Accumulated Other Comprehensive Loss Components | | Years Ended December 31, | | Affected Line Item in the Consolidated Statements of Income | 2016 | | 2015 | | 2014 | | | (Thousands of dollars) | | | Unrealized gains (losses) on risk-management assets/liabilities | | | | | | | | | Commodity contracts | | $ | 26,422 |
| | $ | 81,089 |
| | $ | (21,052 | ) | | Commodity sales revenues | Interest-rate contracts | | (19,215 | ) | | (17,565 | ) | | (21,966 | ) | | Interest expense | | | 7,207 |
| | 63,524 |
| | (43,018 | ) | | Income before income taxes | | | (230 | ) | | (8,815 | ) | | 8,977 |
| | Income tax expense | | | 6,977 |
| | 54,709 |
| | (34,041 | ) | | Income from continuing operations | | | — |
| | — |
| | (7,682 | ) | | Income (loss) from discontinued operations | | | 6,977 |
| | 54,709 |
| | (41,723 | ) | | Net income | Noncontrolling interest | | 6,301 |
| | 39,415 |
| | (19,679 | ) | | Less: Net income attributable to noncontrolling interest | | | $ | 676 |
| | $ | 15,294 |
| | $ | (22,044 | ) | | Net income attributable to ONEOK | | | | | | | | | | Pension and postretirement benefit plan obligations (a) | | | | | | | | | Amortization of net loss | | $ | (12,012 | ) | | $ | (17,724 | ) | | $ | (15,914 | ) | | | Amortization of unrecognized prior service cost | | 1,662 |
| | 1,568 |
| | 1,469 |
| | | | | (10,350 | ) | | (16,156 | ) | | (14,445 | ) | | Income before income taxes | | | 4,140 |
| | 6,462 |
| | 5,778 |
| | Income tax expense | | | (6,210 | ) | | (9,694 | ) | | (8,667 | ) | | Income from continuing operations | | | — |
| | — |
| | (1,648 | ) | | Income (loss) from discontinued operations | | | $ | (6,210 | ) | | $ | (9,694 | ) | | $ | (10,315 | ) | | Net income attributable to ONEOK | | | | | | | | | | Unrealized Gains (Losses) on Risk-Management Assets/Liabilities of Unconsolidated Affiliates | | | | | | | | | | | $ | (63 | ) | | $ | — |
| | $ | — |
| | Equity in net earnings from investments | | | 10 |
| | — |
| | — |
| | Income tax expense | | | (53 | ) | | — |
| | — |
| | Net income | Noncontrolling interest | | (37 | ) | | — |
| | — |
| | Less: Net income attributable to noncontrolling interests | | | $ | (16 | ) | | $ | — |
| | $ | — |
| | Net income attributable to ONEOK | | | | | | | | | | Total reclassifications for the period attributable to ONEOK | | $ | (5,550 | ) | | $ | 5,600 |
| | $ | (32,359 | ) | | 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 L for additional detail of our net periodic benefit cost. |