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Other Comprehensive Income (Loss):
 3 Months Ended
Mar. 31, 2019
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 Condensed 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
March 31, 2019
March 31, 2018
Gains and (losses) on cash flow hedges:
 
 
 
Interest rate swaps
Interest expense
$
(713
)
$
(713
)
Commodity contracts
Fuel, purchased power and cost of natural gas sold

554

(621
)
 
 
(159
)
(1,334
)
Income tax
Income tax benefit (expense)
35

297

Total reclassification adjustments related to cash flow hedges, net of tax
 
$
(124
)
$
(1,037
)
 
 
 
 
Amortization of components of defined benefit plans:
 
 
 
Prior service cost
Operations and maintenance
$
19

$
45

 
 
 
 
Actuarial gain (loss)
Operations and maintenance
(220
)
(622
)
 
 
(201
)
(577
)
Income tax
Income tax benefit (expense)
48

126

Total reclassification adjustments related to defined benefit plans, net of tax
 
$
(153
)
$
(451
)
Total reclassifications
 
$
(277
)
$
(1,488
)

Balances by classification included within AOCI, net of tax on the accompanying Condensed Consolidated Balance Sheets were as follows (in thousands):
 
Interest Rate Swaps
Commodity Derivatives
Employee Benefit Plans
Total
As of December 31, 2018
$
(17,307
)
$
328

$
(9,937
)
$
(26,916
)
Other comprehensive income (loss)
 
 
 
 
before reclassifications
—

180

—

180

Amounts reclassified from AOCI
550

(426
)
153

277

As of March 31, 2019
$
(16,757
)
$
82

$
(9,784
)
$
(26,459
)
 
 
 
 
 
 
 
 
 
 
 
Interest Rate Swaps
Commodity Derivatives
Employee Benefit Plans
Total
Balance as of December 31, 2017
$
(19,581
)
$
(518
)
$
(21,103
)
$
(41,202
)
Other comprehensive income (loss)
 
 
 
 
before reclassifications
—

(228
)
—

(228
)
Amounts reclassified from AOCI
561

476

451

1,488

Reclassifications of certain tax effects from AOCI
15

—

3

18

As of March 31, 2018
$
(19,005
)
$
(270
)
$
(20,649
)
$
(39,924
)