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ACCUMULATED OTHER COMPREHENSIVE LOSS (AOCL) (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Summary of changes in accumulated other comprehensive loss
The following tables summarizes the changes in accumulated other comprehensive loss (AOCL) for the years ended December 31, 2016 and 2015, respectively (in thousands):

 
Postretirement Liability Adjustment
 
Unrealized Gain (Loss) on Derivatives-Other
 
Unrealized Gain (Loss) on Available-for-Sale Securities
 
Total
Balance at January 1, 2016 (a)
$
(12,220
)
 
$
(544
)
 
$
(98
)
 
$
(12,862
)
   Other comprehensive income before
   reclassifications
(3,687
)
 
—

 
323

 
(3,364
)
   Amounts reclassified from AOCL (b)
1,490

 
27

 
(225
)
 
1,292

Net current period other comprehensive income
(2,197
)
 
27

 
98

 
(2,072
)
Balance at December 31, 2016 (a)
$
(14,417
)
 
$
(517
)
 
$
—

 
$
(14,934
)


 
Postretirement Liability Adjustment
 
Unrealized Gain (Loss) on Derivatives-Other
 
Unrealized Gain (Loss) on Available-for-Sale Securities
 
Total
Balance at January 1, 2015 (a)
$
(13,837
)
 
$
(567
)
 
$
(75
)
 
$
(14,479
)
   Other comprehensive income before
   reclassifications
(110
)
 
—

 
(76
)
 
(186
)
   Amounts reclassified from AOCL (b)
1,727

 
23

 
53

 
1,803

Net current period other comprehensive income
1,617

 
23

 
(23
)
 
1,617

Balance at December 31, 2015 (a)
$
(12,220
)
 
$
(544
)
 
$
(98
)
 
$
(12,862
)

(a) Determined using a combined statutory tax rate of 40% in 2016 and 2015.
(b) See table below.
Reclassifications out of AOCL
The reclassifications out of AOCL for the years ended December 31, 2016 and 2015 is as follows (in thousands):

Components of AOCL
Amounts Reclassified from AOCL
 
Affected Line Item in the Statements of Income
For the Year Ended
December 31, 2016
For the Year Ended
December 31, 2015
 
Unrealized Loss on Derivatives-Other - Interest Rate Contracts designated as cash flow hedges
$
46

$
46

 
Interest Charges
  Income Taxes
(19
)
(23
)
 
Income Taxes (a)
 
$
27

$
23

 
 
 
 
 
 
 
Unrealized Loss(Gain) on Available-for-Sale Securities
(377
)
90

 
Other Income & Expense
  Income Taxes
152

(37
)
 
Income Taxes (a)
 
$
(225
)
$
53

 
 
 
 
 
 
 
Actuarial Loss on Postretirement Benefits
2,490

2,891

 
Operating Expenses: Operations
  Income Taxes
(1,000
)
(1,164
)
 
Income Taxes (a)
 
$
1,490

$
1,727

 
 
 
 
 
 
 
Losses from reclassifications for the period
net of tax
$
1,292

$
1,803

 
 


(a) Determined using a combined statutory tax rate of 40% in 2016 and 2015.