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Accumulated other comprehensive income (loss) (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Accumulated comprehensive loss
The after-tax changes in the components of accumulated other comprehensive income (loss) were as follows:
Six Months Ended June 30, 2019
Net Unrealized Gain (Loss) on Derivative
Instruments
Qualifying as Hedges

Postretirement
Liability Adjustment

Net Unrealized
Gain (Loss) on
Available-for-sale
Investments

Total
Accumulated
Other
Comprehensive
Loss

 
(In thousands)
At December 31, 2018
$
(2,161
)
$
(36,069
)
$
(112
)
$
(38,342
)
Other comprehensive income before reclassifications
—

—

39

39

Amounts reclassified from accumulated other comprehensive loss
397

310

28

735

Net current-period other comprehensive income
397

310

67

774

At March 31, 2019
$
(1,764
)
$
(35,759
)
$
(45
)
$
(37,568
)
Other comprehensive income before reclassifications
—

—

79

79

Amounts reclassified from accumulated other comprehensive loss
111

276

12

399

Net current-period other comprehensive income
111

276

91

478

At June 30, 2019
$
(1,653
)
$
(35,483
)
$
46

$
(37,090
)
Six Months Ended June 30, 2018
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)
At December 31, 2017
$
(1,934
)
$
(35,163
)
$
(155
)
$
(82
)
$
(37,334
)
Other comprehensive loss before reclassifications
—

—

(2
)
(105
)
(107
)
Amounts reclassified from accumulated other comprehensive loss
92

418

—

30

540

Net current-period other comprehensive income (loss)
92

418

(2
)
(75
)
433

Reclassification adjustment of prior period tax effects related to TCJA included in accumulated other comprehensive loss
(389
)
(7,520
)
(33
)
(17
)
(7,959
)
At March 31, 2018
$
(2,231
)
$
(42,265
)
$
(190
)
$
(174
)
$
(44,860
)
Other comprehensive loss before reclassifications
—

—

(59
)
(43
)
(102
)
Amounts reclassified from accumulated other comprehensive loss
95

449

249

34

827

Net current-period other comprehensive income (loss)
95

449

190

(9
)
725

At June 30, 2018
$
(2,136
)
$
(41,816
)
$
—

$
(183
)
$
(44,135
)
Reclassification out of accumulated other comprehensive loss
The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parenthesis indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications were as follows:
 
Three Months Ended
Six Months Ended
Location on Consolidated Statements of
Income
 
June 30,
June 30,
 
2019
2018
2019
2018
 
(In thousands)
 
Reclassification adjustment for loss on derivative instruments included in net income
$
(147
)
$
(148
)
$
(295
)
$
(296
)
Interest expense
 
36

53

(213
)
109

Income taxes
 
(111
)
(95
)
(508
)
(187
)
 
Amortization of postretirement liability losses included in net periodic benefit cost (credit)
(365
)
(594
)
(775
)
(1,167
)
Other income
 
89

145

189

300

Income taxes
 
(276
)
(449
)
(586
)
(867
)
 
Reclassification adjustment for loss on foreign currency translation adjustment included in net income
—

(324
)
—

(324
)
Other income
 
—

75

—

75

Income taxes
 
—

(249
)
—

(249
)
 
Reclassification adjustment on available-for-sale investments included in net income
(15
)
(44
)
(50
)
(81
)
Other income
 
3

10

10

17

Income taxes
 
(12
)
(34
)
(40
)
(64
)
 
Total reclassifications
$
(399
)
$
(827
)
$
(1,134
)
$
(1,367
)