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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Summary of Other Comprehensive (Loss) Income
The other comprehensive (loss) income consists of the following components:
 
Three Months Ended June 30
  
2018
 
2017
  
Before-Tax
 
Income
 
After-Tax
 
Before-Tax
 
Income
 
After-Tax
(in thousands)
Amount
 
Tax
 
Amount
 
Amount
 
Tax
 
Amount
Foreign currency translation adjustments:
  
 
  
 
  
 
  
 
  
 
  
Translation adjustments arising during the period
$
(31,167
)
 
$
—

 
$
(31,167
)
 
$
9,638

 
$
—

 
$
9,638

Unrealized gains on available-for-sale securities:
 
 
  
 
  
 
  
 
  
 
  
Unrealized gains for the period, net
—

 
—

 
—

 
13,976

 
(5,591
)
 
8,385

Pension and other postretirement plans:
  
 
  
 
  
 
  
 
  
 
  
Amortization of net prior service cost included in net income
70

 
(19
)
 
51

 
120

 
(48
)
 
72

Amortization of net actuarial gain included in net income
(3,294
)
 
888

 
(2,406
)
 
(1,568
)
 
627

 
(941
)
 
(3,224
)
 
869

 
(2,355
)
 
(1,448
)
 
579

 
(869
)
Cash flow hedge:
  
 
  
 
  
 
  
 
  
 
  
Gain (loss) for the period
371

 
(70
)
 
301

 
(19
)
 
4

 
(15
)
Other Comprehensive (Loss) Income
$
(34,020
)
 
$
799

 
$
(33,221
)
 
$
22,147

 
$
(5,008
)
 
$
17,139

  
Six Months Ended June 30
  
2018
 
2017
  
Before-Tax
 
Income
 
After-Tax
 
Before-Tax
 
Income
 
After-Tax
(in thousands)
Amount
 
Tax
 
Amount
 
Amount
 
Tax
 
Amount
Foreign currency translation adjustments:
  
 
  
 
  
 
  
 
  
 
  
Translation adjustments arising during the period
$
(19,603
)
 
$
—

 
$
(19,603
)
 
$
23,306

 
$
—

 
$
23,306

Unrealized gains on available-for-sale securities:
 
 
  
 
  
 
 
 
  
 
  
Unrealized gains for the period, net
—

 
—

 
—

 
23,534

 
(9,414
)
 
14,120

Pension and other postretirement plans:
  
 
  
 
  
 
  
 
  
 
  
Amortization of net prior service cost included in net income
146

 
(40
)
 
106

 
240

 
(96
)
 
144

Amortization of net actuarial gain included in net income
(4,661
)
 
1,257

 
(3,404
)
 
(3,391
)
 
1,356

 
(2,035
)
  
(4,515
)
 
1,217

 
(3,298
)
 
(3,151
)
 
1,260

 
(1,891
)
Cash flow hedge:
 
 
  
 
  
 
  
 
  
 
  
Gain (loss) for the period
607

 
(115
)
 
492

 
(143
)
 
29

 
(114
)
Other Comprehensive (Loss) Income
$
(23,511
)
 
$
1,102

 
$
(22,409
)
 
$
43,546

 
$
(8,125
)
 
$
35,421
Summary of Changes in Accumulated Other Comprehensive (Loss) Income
The accumulated balances related to each component of other comprehensive income (loss) are as follows:
(in thousands, net of taxes)
Cumulative
Foreign
Currency
Translation
Adjustment
 
Unrealized Gain
on Available-for- Sale Securities
 
Unrealized Gain
on Pensions
and Other
Postretirement
Plans
 
Cash Flow
Hedge
 
Accumulated
Other
Comprehensive
Income
Balance as of December 31, 2017
$
6,314

 
$
194,889

 
$
334,536

 
$
(184
)
 
$
535,555

Reclassification of unrealized gains on available-for-sale-securities to retained earnings as a result of adoption of new guidance
—

 
(194,889
)
 
—

 
—

 
(194,889
)
Other comprehensive (loss) income before reclassifications
(19,603
)
 
—

 
—

 
526

 
(19,077
)
Net amount reclassified from accumulated other comprehensive income (loss)
—

 
—

 
(3,298
)
 
(34
)
 
(3,332
)
Other comprehensive (loss) income, net of tax
(19,603
)
 
—

 
(3,298
)
 
492

 
(22,409
)
Balance as of June 30, 2018
$
(13,289
)
 
$
—

 
$
331,238

 
$
308

 
$
318,257
Summary of Amounts and Line Items of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
The amounts and line items of reclassifications out of Accumulated Other Comprehensive Income (Loss) are as follows:
  
Three Months Ended 
 June 30
 
Six Months Ended 
 June 30
 
Affected Line Item in the Condensed Consolidated Statement of Operations
  
 
 
(in thousands)
2018
 
2017
 
2018
 
2017
 
Pension and Other Postretirement Plans:
  
 
  
 
 
 
  
 
  
Amortization of net prior service cost
$
70

 
$
120

 
$
146

 
$
240

 
(1)
Amortization of net actuarial gain
(3,294
)
 
(1,568
)
 
(4,661
)
 
(3,391
)
 
(1)
  
(3,224
)
 
(1,448
)
 
(4,515
)
 
(3,151
)
 
Before tax
  
869

 
579

 
1,217

 
1,260

 
Provision for Income Taxes
  
(2,355
)
 
(869
)
 
(3,298
)
 
(1,891
)
 
Net of Tax
Cash Flow Hedge
 
 
 
 
 
 
  
 
  
  
(45
)
 
41

 
(42
)
 
72

 
Interest expense
  
9

 
(8
)
 
8

 
(14
)
 
Provision for Income Taxes
  
(36
)
 
33

 
(34
)
 
58

 
Net of Tax
Total reclassification for the period
$
(2,391
)
 
$
(836
)
 
$
(3,332
)
 
$
(1,833
)
 
Net of Tax
____________
(1)
These accumulated other comprehensive income components are components of net periodic pension and postretirement plan cost (see Note 12) and are included in non-operating pension and postretirement benefit income in the Company’s Condensed Consolidated Statements of Operations.