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ACCUMULATED OTHER COMPREHENSIVE LOSS (AOCL) (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Summary of Changes
The following table summarizes the changes in accumulated other comprehensive loss (AOCL) for the year ended December 31, 2016 (in thousands):

 
Postretirement Liability Adjustment
 
Unrealized Gain (Loss) on Derivatives-Other
 
Unrealized Gain (Loss) on Available-for-Sale Securities
 
Other Comprehensive Income (Loss) of Affiliated Companies
 
Total
Balance at January 1, 2016 (a)
$
(22,145
)
 
$
(2,129
)
 
$
(128
)
 
$
(97
)
 
$
(24,499
)
   Other comprehensive income before reclassifications
(5,617
)
 
—

 
323

 
—

 
(5,294
)
   Amounts reclassified from AOCL (b)
2,420

 
197

 
(205
)
 
—

 
2,412

Net current period other comprehensive income
(3,197
)
 
197

 
118

 
—

 
(2,882
)
Balance at December 31, 2016 (a)
$
(25,342
)
 
$
(1,932
)
 
$
(10
)
 
$
(97
)
 
$
(27,381
)

(a) Determined using a combined average statutory tax rate of 40%.
(b) See table below.

The following table provides details about reclassifications out of AOCL for the year ended December 31, 2016 (in thousands):

 
Amounts Reclassified from AOCL
 
Affected Line Item in the Statements of Consolidated Income
For the Year Ended December 31, 2016
 
Actuarial Loss on Postretirement Benefits
$
4,001

 
Operating Expenses: Operations
   Income Taxes
(1,581
)
 
Income Taxes (a)
 
$
2,420

 
 
Unrealized Loss on Derivatives-Other - interest rate contracts designated as cash flow hedges
$
333

 
Interest Charges
   Income Taxes
(136
)
 
Income Taxes (a)
 
$
197

 
 
 
 
 
 
Unrealized Gain on Available-for-Sale Securities
$
(342
)
 
Other Income
   Income Taxes
137

 
Income Taxes (a)
 
$
(205
)
 
 
 
 
 
 
Losses from reclassifications for the period net of tax
$
2,412

 
 


(a) Determined using a combined average statutory tax rate of 40%.