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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 12 Months Ended
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
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.