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Comprehensive income (loss)
 6 Months Ended
Jun. 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 June 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
)
(187
)
—

(302
)
(6,083
)
Amounts reclassified from accumulated other comprehensive loss
(3,168
)
79

1,072

—

(2,017
)
Net current-period other comprehensive income (loss)
(8,762
)
(108
)
1,072

(302
)
(8,100
)
Balance at June 30, 2013
$
(2,744
)
$
11

$
(53,275
)
$
(813
)
$
(56,821
)


Reclassifications out of accumulated other comprehensive loss were as follows:
 
Three Months Ended
Six Months Ended
Location on Consolidated Statements of Income
 
June 30, 2013
June 30, 2013
 
(In thousands)
 
Reclassification adjustment for gain (loss) on derivative instruments included in net income
 
 
 
Commodity derivative instruments
$
1,382

$
5,896

Operating revenues
Interest rate derivative instruments
(664
)
(780
)
Interest expense
 
718

5,116

 
 
(322
)
(1,948
)
Income taxes
 
396

3,168

 
Amortization of postretirement liability losses included in net periodic benefit cost
(967
)
(1,934
)
(a)
 
543

862

Income taxes
 
(424
)
(1,072
)
 
Reclassification adjustment for loss on available-for-sale investments included in net income
(67
)
(121
)
Other income
 
23

42

Income taxes
 
(44
)
(79
)
 
Total reclassifications
$
(72
)
$
2,017

 
 (a) Included in net periodic benefit cost (credit). For more information, see Note 17.