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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2013
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)
Cash Flow Hedges
Pension and Postretirement Plans
Total
Balance as of December 31, 2012
$
44,196

$
(52,507
)
$
(8,311
)
Other comprehensive loss before reclassifications
(10,644
)
—

(10,644
)
Amounts reclassified from accumulated other comprehensive income (loss)
(12,967
)
3,268

(9,699
)
Change in accumulated other comprehensive income (loss)
(23,611
)
3,268

(20,343
)
Balance as of June 30, 2013
$
20,585

$
(49,239
)
$
(28,654
)
Reclassification out of Accumulated Other Comprehensive Income
The following table provides details of the reclassifications out of accumulated other comprehensive income (loss).

 
Three months ended
Six months ended
 
 
June 30, 2013
June 30, 2013
 
(in thousands)
Amounts Reclassified
Line Item Where Presented
Gains and (losses) on cash flow hedges:
 
 
 
Commodity contracts
$
4,503

$
21,792

Operating revenues
Interest rate swap
(426
)
(836
)
Interest expense
Total cash flow hedges
4,077

20,956

 
Income tax expense
(1,562
)
(7,989
)
 
Net of tax
2,515

12,967

 
Pension and postretirement plans:
 
 
 
Transition obligation
(74
)
(147
)
Operations and maintenance
Prior service cost
(78
)
(157
)
Operations and maintenance
Actuarial losses*
(2,097
)
(4,350
)
Operations and maintenance
Actuarial losses on settlement charges*
—

(375
)
Regulatory asset
Total pension and postretirement plans
(2,249
)
(5,029
)
 
Income tax expense
788

1,761

 
Net of tax
(1,461
)
(3,268
)
 
Total reclassifications for the period
$
1,054

$
9,699

 

* In the first quarter of 2013, the Company incurred a settlement charge of $0.5 million for the payment of lump sums from the nonqualified supplemental retirement plans, of which $0.1 million is recognized in actuarial losses above and $0.4 million is recognized as a regulatory asset at Alagasco and reported in actuarial losses on settlement charges above.