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Other comprehensive income
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Other comprehensive income Other comprehensive income

Reclassification adjustments – Information regarding amounts reclassified from accumulated other comprehensive loss to net income was as follows:
Accumulated other comprehensive loss components
 
Amounts reclassified from accumulated other comprehensive loss
 
Affected line item in consolidated statements of comprehensive income
 
 
Quarter Ended
June 30,
 
Six Months Ended
June 30,
 
 
(in thousands)
 
2018
 
2017
 
2018
 
2017
 
 
Amortization of postretirement benefit plan items:
 
 
 
 
 
 
 
 
 
 
Prior service credit
 
$
355

 
$
355

 
$
711

 
$
711

 
Other income
Net actuarial loss
 
(721
)
 
(909
)
 
(1,442
)
 
(1,819
)
 
Other income
Total amortization
 
(366
)
 
(554
)
 
(731
)
 
(1,108
)
 
Other income
Tax benefit
 
45

 
165

 
400

 
330

 
Income tax provision
Total reclassifications, net of tax
 
$
(321
)
 
$
(389
)
 
$
(331
)
 
$
(778
)
 
Net income


Accumulated other comprehensive loss – Changes in the components of accumulated other comprehensive loss during the six months ended June 30, 2018 were as follows:
(in thousands)
 
Postretirement benefit plans
 
Net unrealized loss on marketable debt securities,
net of tax(1)
 
Currency translation adjustment
 
Accumulated other comprehensive loss
Balance, December 31, 2017
 
$
(26,829
)
 
$
(322
)
 
$
(10,446
)
 
$
(37,597
)
Other comprehensive loss before reclassifications
 
—

 
(69
)
 
(4,968
)
 
(5,037
)
Amounts reclassified from accumulated other comprehensive loss
 
331

 
—

 
—

 
331

Net current-period other comprehensive income (loss)
 
331

 
(69
)
 
(4,968
)
 
(4,706
)
Adoption of ASU No. 2018-02
 
(6,867
)
 
—

 
—

 
(6,867
)
Balance, June 30, 2018
 
$
(33,365
)
 
$
(391
)
 
$
(15,414
)
 
$
(49,170
)


(1) Other comprehensive loss before reclassifications is net of income tax benefit of $24.