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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Notes)
9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Comprehensive Income (Loss) Note [Text Block]
7.
ACCUMULATED OTHER COMPREHENSIVE INCOME

The following table sets forth the effect of reclassifications from accumulated other comprehensive income in our Consolidated Statements of Income for the periods indicated:
 
 
Three Months Ended
 
Nine Months Ended
 
Affected Line Item in the
Details about Accumulated Other
 
September 30,
 
September 30,
 
 Consolidated Statements
Comprehensive Income Components
 
2018
2017
 
2018
2017
 
of Income
 
 
(Thousands of dollars)
 
 
Pension and other postemployment benefit plan obligations (a)
 
 
 
 
 
 
 
 
Amortization of net loss
 
$
10,950

$
10,648

 
$
32,850

$
31,944

 
 
Amortization of unrecognized prior service cost
 
(1,142
)
(1,149
)
 
(3,426
)
(3,447
)
 
 
 
 
9,808

9,499

 
29,424

28,497

 
 
Regulatory adjustments (b)
 
(9,537
)
(9,290
)
 
(28,611
)
(27,869
)
 
 
 
 
271

209

 
813

628

 
Income before income taxes
 
 
(68
)
(81
)
 
(487
)
(242
)
 
Income tax expense
Total reclassifications for the period
 
$
203

$
128

 
$
326

$
386

 
Net income
(a) These components of accumulated other comprehensive income are included in the computation of net periodic benefit cost. See Note 9 for additional detail of our net periodic benefit cost.
(b) Regulatory adjustments represent pension and other postemployment benefit costs expected to be recovered through rates and are deferred as part of our regulatory assets. See Note 3 for additional disclosures of regulatory assets and liabilities.