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Comprehensive income (loss) (Tables)
 9 Months Ended
Sep. 30, 2014
Comprehensive income (loss) [Abstract]  
Comprehensive income (loss)
The after-tax changes in the components of accumulated other comprehensive loss were as follows:

Three Months Ended September 30, 2014
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 beginning of period
$
(3,408
)
$
(33,287
)
$
(579
)
$
76

$
(37,198
)
Other comprehensive income (loss) before reclassifications
—

—

(146
)
(62
)
(208
)
Amounts reclassified from accumulated other comprehensive loss
82

261

—

31

374

Net current-period other comprehensive income (loss)
82

261

(146
)
(31
)
166

Balance at end of period
$
(3,326
)
$
(33,026
)
$
(725
)
$
45

$
(37,032
)

Three Months Ended September 30, 2013
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 beginning of period
$
(2,744
)
$
(53,275
)
$
(813
)
$
11

$
(56,821
)
Other comprehensive income (loss) before reclassifications
—

—

(20
)
(10
)
(30
)
Amounts reclassified from accumulated other comprehensive loss
(510
)
272

114

38

(86
)
Net current-period other comprehensive income (loss)
(510
)
272

94

28

(116
)
Balance at end of period
$
(3,254
)
$
(53,003
)
$
(719
)
$
39

$
(56,937
)

Nine Months Ended September 30, 2014
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 beginning of period
$
(3,765
)
$
(33,807
)
$
(667
)
$
34

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

—

(58
)
(89
)
(147
)
Amounts reclassified from accumulated other comprehensive loss
439

781

—

100

1,320

Net current-period other comprehensive income (loss)
439

781

(58
)
11

1,173

Balance at end of period
$
(3,326
)
$
(33,026
)
$
(725
)
$
45

$
(37,032
)


Nine Months Ended September 30, 2013
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 beginning of period
$
6,018

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

$
(48,721
)
Other comprehensive income (loss) before reclassifications
(5,594
)
—

(351
)
(197
)
(6,142
)
Amounts reclassified from accumulated other comprehensive loss
(3,678
)
1,344

143

117

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

(208
)
(80
)
(8,216
)
Balance at end of period
$
(3,254
)
$
(53,003
)
$
(719
)
$
39

$
(56,937
)
Reclassification out of accumulated other comprehensive income
Reclassifications out of accumulated other comprehensive loss were as follows:
 
Three Months Ended
Nine Months Ended
Location on Consolidated Statements of Income
 
September 30,
September 30,
 
2014
2013
2014
2013
 
(In thousands)
 
Reclassification adjustment for gain (loss) on derivative instruments included in net income:
 
 
 
 
 
Commodity derivative instruments
$
28

$
1,007

$
(223
)
$
6,903

Operating revenues
Interest rate derivative instruments
(160
)
(200
)
(480
)
(979
)
Interest expense
 
(132
)
807

(703
)
5,924

 
 
50

(297
)
264

(2,246
)
Income taxes
 
(82
)
510

(439
)
3,678

 
Amortization of postretirement liability losses included in net periodic benefit cost
(420
)
(437
)
(1,258
)
(2,371
)
(a)
 
159

166

477

1,027

Income taxes
 
(261
)
(271
)
(781
)
(1,344
)
 
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
)
 
Reclassification adjustment for loss on available-for-sale investments included in net income
(47
)
(58
)
(154
)
(180
)
Other income
 
16

20

54

63

Income taxes
 
(31
)
(38
)
(100
)
(117
)
 
Total reclassifications
$
(374
)
$
86

$
(1,320
)
$
2,074

 
 (a) Included in net periodic benefit cost (credit). For more information, see Note 20.