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Other Comprehensive Income (Loss):
9 Months Ended
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]  
Other Comprehensive Income (Loss)
OTHER COMPREHENSIVE INCOME (LOSS)

We record deferred gains (losses) in AOCI related to interest rate swaps designated as cash flow hedges, commodity contracts designated as cash flow hedges and the amortization of components of our defined benefit plans. Deferred gains (losses) for our commodity contracts designated as cash flow hedges are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate swaps are recognized in earnings as they are amortized.

The following table details reclassifications out of AOCI and into net income. The amounts in parentheses below indicate decreases to net income in the Consolidated Statements of Income for the period, net of tax (in thousands):
 
Location on the Condensed Consolidated Statements of Income
Amount Reclassified from AOCI
Three Months Ended
 
Nine Months Ended
September 30, 2017
September 30, 2016
 
September 30, 2017
September 30, 2016
Gains and (losses) on cash flow hedges:
 
 
 
 
 
 
Interest rate swaps
Interest expense
$
(713
)
$
(840
)
 
$
(2,228
)
$
(2,530
)
Commodity contracts
Revenue
295

2,201

 
954

9,140

Commodity contracts
Fuel, purchased power and cost of natural gas sold

(34
)
128

 
(20
)
(23
)
 
 
(452
)
1,489

 
(1,294
)
6,587

Income tax
Income tax benefit (expense)
154

(566
)
 
435

(2,450
)
Total reclassification adjustments related to cash flow hedges, net of tax
 
$
(298
)
$
923

 
$
(859
)
$
4,137

 
 
 
 
 
 
 
Amortization of components of defined benefit plans:
 
 
 
 
 
 
Prior service cost
Operations and maintenance
$
49

$
55

 
$
146

$
165

Actuarial gain (loss)
Operations and maintenance
(414
)
(494
)
 
(1,242
)
(1,483
)
 
 
(365
)
(439
)
 
(1,096
)
(1,318
)
Income tax
Income tax benefit (expense)
128

152

 
393

460

Total reclassification adjustments related to defined benefit plans, net of tax
 
$
(237
)
$
(287
)
 
$
(703
)
$
(858
)
Total reclassifications
 
$
(535
)
$
636

 
$
(1,562
)
$
3,279


Balances by classification included within AOCI, net of tax on the accompanying Condensed Consolidated Balance Sheets were as follows (in thousands):
 
Derivatives Designated as Cash Flow Hedges
 
 
 
Interest Rate Swaps
Commodity Derivatives
Employee Benefit Plans
Total
As of December 31, 2016
$
(18,109
)
$
(233
)
$
(16,541
)
$
(34,883
)
Other comprehensive income (loss)
 
 
 
 
before reclassifications

755


755

Amounts reclassified from AOCI
1,449

(590
)
703

1,562

Ending Balance September 30, 2017
$
(16,660
)
$
(68
)
$
(15,838
)
$
(32,566
)
 
 
 
 
 
 
 
 
 
 
 
Derivatives Designated as Cash Flow Hedges
 
 
 
Interest Rate Swaps
Commodity Derivatives
Employee Benefit Plans
Total
Balance as of December 31, 2015
$
(341
)
$
7,066

$
(15,780
)
$
(9,055
)
Other comprehensive income (loss)
 
 
 
 
before reclassifications
(20,200
)
(417
)

(20,617
)
Amounts reclassified from AOCI
1,644

(5,781
)
858

(3,279
)
Ending Balance September 30, 2016
$
(18,897
)
$
868

$
(14,922
)
$
(32,951
)