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Comprehensive income (loss) (Tables)
 3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Comprehensive income (loss)
The after-tax changes in the components of accumulated other comprehensive loss were as follows:
Three Months Ended
March 31, 2016
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
$
(2,667
)
$
(34,257
)
$
(200
)
$
(24
)
$
(37,148
)
Other comprehensive income before reclassifications
—

—

25

8

33

Amounts reclassified from accumulated other comprehensive loss
92

(1,595
)
—

36

(1,467
)
Net current-period other comprehensive income (loss)
92

(1,595
)
25

44

(1,434
)
Balance at end of period
$
(2,575
)
$
(35,852
)
$
(175
)
$
20

$
(38,582
)
Three Months Ended
March 31, 2015
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
$
(3,071
)
$
(38,218
)
$
(829
)
$
15

$
(42,103
)
Other comprehensive loss before reclassifications
—

—

(112
)
(21
)
(133
)
Amounts reclassified from accumulated other comprehensive loss
99

375

802

36

1,312

Net current-period other comprehensive income (loss)
99

375

690

15

1,179

Balance at end of period
$
(2,972
)
$
(37,843
)
$
(139
)
$
30

$
(40,924
)
 
 
 
 
 
 

 
 
 
 
 
 
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,
 
2016
2015
 
(In thousands)
 
Reclassification adjustment for loss on derivative instruments included in net income (loss):
 
 
 
Interest rate derivative instruments
$
(149
)
$
(159
)
Interest expense
 
57

60

Income taxes
 
(92
)
(99
)
 
Amortization of postretirement liability gains (losses) included in net periodic benefit cost
2,564

(605
)
(a)
 
(969
)
230

Income taxes
 
1,595

(375
)
 
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss)
—

(1,292
)
Other income
 
—

490

Income taxes
 
—

(802
)
 
Reclassification adjustment for loss on available-for-sale investments included in net income (loss)
(55
)
(55
)
Other income
 
19

19

Income taxes
 
(36
)
(36
)
 
Total reclassifications
$
1,467

$
(1,312
)
 
 (a) Included in net periodic benefit cost. For more information, see Note 15.