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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table provides changes in the components of accumulated other comprehensive income (loss), net of the related income tax effects:

(in thousands)
 
Pension and Postretirement Plans
Balance as of December 31, 2014
 
$
(22,870
)
Other comprehensive income before reclassifications
 
3,305

Amounts reclassified from accumulated other comprehensive income
 
19,828

Change in accumulated other comprehensive income (loss)
 
23,133

Balance as of December 31, 2015
 
$
263
Reclassification out of Accumulated Other Comprehensive Income
The following table provides details of the reclassifications out of accumulated other comprehensive income (loss):

Years ended December 31, (in thousands)
2015
2014
2013
 
 
 
Amounts Reclassified
Line Item Where Presented
Gains (losses) on cash flow hedges:
 
 
 
 
Commodity contracts
$
—

$
21,611

$
35,684

Gain (loss) on derivative instruments, net
Interest rate swap
—

(2,280
)
(1,723
)
Interest expense
Total cash flow hedges
—

19,331

33,961

 
Income tax expense
—

(7,414
)
(12,957
)
 
Net of tax
—

11,917

21,004

 
Pension and postretirement plans:
 
 
 
 
Transition obligation
—

(22
)
(319
)
General and administrative
Prior service cost
—

(248
)
(257
)
General and administrative
Actuarial losses
(30,504
)
(21,932
)
(12,357
)
General and administrative
Actuarial losses on settlement charges*
—

—

(421
)
Assets held for sale
Total pension and postretirement plans
(30,504
)
(22,202
)
(13,354
)
 
Income tax benefit
10,676

7,771

4,674

 
Net of tax
(19,828
)
(14,431
)
(8,680
)
 
Total reclassifications for the period
$
(19,828
)
$
(2,514
)
$
12,324

 
*During the year ended December 31, 2013, Energen incurred settlement charges of $0.6 million for the payment of lump sums from the nonqualified supplemental retirement plans, of which $0.2 million was recognized in actuarial losses above and $0.4 million was recognized as a regulatory asset at Alagasco and reported in actuarial losses on settlement charges above.