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Comprehensive income (loss)
 9 Months Ended
Sep. 30, 2013
Comprehensive income (loss) [Abstract]  
Comprehensive income (loss)
Comprehensive income (loss)
The after-tax changes in the components of accumulated other comprehensive loss as of September 30, 2013, were as follows:

 
Net Unrealized Gain (Loss) on Derivative
 Instruments
 Qualifying as Hedges
Net Unrealized Gain (Loss) on Available-for-sale Investments
Postretirement
 Liability Adjustment
Foreign Currency Translation Adjustment
Total Accumulated
 Other
Comprehensive
 Loss
 
(In thousands)
Balance at December 31, 2012
$
6,018

$
119

$
(54,347
)
$
(511
)
$
(48,721
)
Other comprehensive income (loss) before reclassifications
(5,594
)
(197
)
—

(351
)
(6,142
)
Amounts reclassified from accumulated other comprehensive loss
(3,678
)
117

1,344

143

(2,074
)
Net current-period other comprehensive income (loss)
(9,272
)
(80
)
1,344

(208
)
(8,216
)
Balance at September 30, 2013
$
(3,254
)
$
39

$
(53,003
)
$
(719
)
$
(56,937
)


Reclassifications out of accumulated other comprehensive loss were as follows:
 
Three Months Ended
Nine Months Ended
Location on Consolidated Statements of Income
 
September 30, 2013
September 30, 2013
 
(In thousands)
 
Reclassification adjustment for gain (loss) on derivative instruments included in net income
 
 
 
Commodity derivative instruments
$
1,007

$
6,903

Operating revenues
Interest rate derivative instruments
(200
)
(979
)
Interest expense
 
807

5,924

 
 
(297
)
(2,246
)
Income taxes
 
510

3,678

 
Amortization of postretirement liability losses included in net periodic benefit cost
(437
)
(2,371
)
(a)
 
166

1,027

Income taxes
 
(271
)
(1,344
)
 
Reclassification adjustment for loss on available-for-sale investments included in net income
(58
)
(180
)
Other income
 
20

63

Income taxes
 
(38
)
(117
)
 
Reclassification adjustment for loss on foreign currency translation adjustment included in net income
(185
)
(213
)
Earnings (loss) from equity method investments
 
70

70

Earnings (loss) from equity method investments
 
(115
)
(143
)
 
Total reclassifications
$
86

$
2,074

 
 (a) Included in net periodic benefit cost (credit). For more information, see Note 18.