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Comprehensive income (loss) (Tables)
 3 Months Ended
Mar. 31, 2014
Comprehensive income (loss) [Abstract]  
Comprehensive income (loss)
The after-tax changes in the components of accumulated other comprehensive loss at March 31, 2014, were as follows:

 
Net Unrealized Gain (Loss) on Derivative
 Instruments
 Qualifying as Hedges
Postretirement
 Liability Adjustment
Foreign Currency Translation Adjustment
Net Unrealized Gain (Loss) on Available-for-sale Investments
Total Accumulated
 Other
Comprehensive
 Loss
 
(In thousands)
Balance at December 31, 2013
$
(3,765
)
$
(33,807
)
$
(667
)
$
34

$
(38,205
)
Other comprehensive income (loss) before reclassifications
—

—

46

(36
)
10

Amounts reclassified from accumulated other comprehensive loss
344

275

—

38

657

Net current-period other comprehensive income
344

275

46

2

667

Balance at March 31, 2014
$
(3,421
)
$
(33,532
)
$
(621
)
$
36

$
(37,538
)


The after-tax changes in the components of accumulated other comprehensive loss at March 31, 2013, were as follows:

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

$
(54,347
)
$
(511
)
$
119

$
(48,721
)
Other comprehensive income (loss) before reclassifications
(5,849
)
—

88

(44
)
(5,805
)
Amounts reclassified from accumulated other comprehensive loss
(2,772
)
648

—

35

(2,089
)
Net current-period other comprehensive income (loss)
(8,621
)
648

88

(9
)
(7,894
)
Balance at March 31, 2013
$
(2,603
)
$
(53,699
)
$
(423
)
$
110

$
(56,615
)
Reclassification out of accumulated other comprehensive income
Reclassifications out of accumulated other comprehensive loss were as follows:
 
Three Months Ended
Location on Consolidated Statements of Income
 
March 31, 2014
March 31, 2013
 
(In thousands)
 
Reclassification adjustment for gain (loss) on derivative instruments included in net income:
 
 
 
Commodity derivative instruments
$
(388
)
$
4,513

Operating revenues
Interest rate derivative instruments
(160
)
(115
)
Interest expense
 
(548
)
4,398

 
 
204

(1,626
)
Income taxes
 
(344
)
2,772

 
Amortization of postretirement liability losses included in net periodic benefit cost
(443
)
(967
)
(a)
 
168

319

Income taxes
 
(275
)
(648
)
 
Reclassification adjustment for loss on available-for-sale investments included in net income
(58
)
(54
)
Other income
 
20

19

Income taxes
 
(38
)
(35
)
 
Total reclassifications
$
(657
)
$
2,089

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