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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Summary of Other Comprehensive (Loss) Income
The other comprehensive income (loss) consists of the following components:
 
Three Months Ended June 30
  
2017
 
2016
  
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
$
9,638

 
$
—

 
$
9,638

 
$
(5,121
)
 
$
—

 
$
(5,121
)
Unrealized gains (losses) on available-for-sale securities:
 
 
  
 
  
 
  
 
  
 
  
Unrealized gains (losses) for the period, net
13,976

 
(5,591
)
 
8,385

 
(5,307
)
 
2,123

 
(3,184
)
Reclassification of realized gain on sale of available-for-sale securities included in net income
—

 
—

 
—

 
(4,502
)
 
1,801

 
(2,701
)
  
13,976

 
(5,591
)
 
8,385

 
(9,809
)
 
3,924

 
(5,885
)
Pension and other postretirement plans:
  
 
  
 
  
 
  
 
  
 
  
Amortization of net prior service cost included in net income
120

 
(48
)
 
72

 
105

 
(43
)
 
62

Amortization of net actuarial (gain) loss included in net income
(1,568
)
 
627

 
(941
)
 
289

 
(115
)
 
174

 
(1,448
)
 
579

 
(869
)
 
394

 
(158
)
 
236

Cash flow hedge:
  
 
  
 
  
 
  
 
  
 
  
Loss for the period
(19
)
 
4

 
(15
)
 
—

 
—

 
—

Other Comprehensive Income (Loss)
$
22,147

 
$
(5,008
)
 
$
17,139

 
$
(14,536
)
 
$
3,766

 
$
(10,770
)
  
Six Months Ended June 30
  
2017
 
2016
  
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
$
23,306

 
$
—

 
$
23,306

 
$
(1,276
)
 
$
—

 
$
(1,276
)
Unrealized gains (losses) on available-for-sale securities:
 
 
  
 
  
 
 
 
  
 
  
Unrealized gains (losses) for the period, net
23,534

 
(9,414
)
 
14,120

 
(4,964
)
 
1,986

 
(2,978
)
Reclassification of realized gain on sale of available-for-sale securities included in net income
—

 
—

 
—

 
(6,256
)
 
2,502

 
(3,754
)
  
23,534

 
(9,414
)
 
14,120

 
(11,220
)
 
4,488

 
(6,732
)
Pension and other postretirement plans:
  
 
  
 
  
 
  
 
  
 
  
Amortization of net prior service cost included in net income
240

 
(96
)
 
144

 
209

 
(84
)
 
125

Amortization of net actuarial (gain) loss included in net income
(3,391
)
 
1,356

 
(2,035
)
 
579

 
(231
)
 
348

  
(3,151
)
 
1,260

 
(1,891
)
 
788

 
(315
)
 
473

Cash flow hedge:
 
 
  
 
  
 
  
 
  
 
  
Loss for the period
(143
)
 
29

 
(114
)
 
—

 
—

 
—

Other Comprehensive Income (Loss)
$
43,546

 
$
(8,125
)
 
$
35,421

 
$
(11,708
)
 
$
4,173

 
$
(7,535
)
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, 2016
$
(26,998
)
 
$
92,931

 
$
170,830

 
$
(277
)
 
$
236,486

Other comprehensive income (loss) before reclassifications
23,306

 
14,120

 
—

 
(172
)
 
37,254

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

 
—

 
(1,891
)
 
58

 
(1,833
)
Other comprehensive income (loss), net of tax
23,306

 
14,120

 
(1,891
)
 
(114
)
 
35,421

Balance as of June 30, 2017
$
(3,692
)
 
$
107,051

 
$
168,939

 
$
(391
)
 
$
271,907
Summary of Amounts and Line Items of reclassifications Out of Accumulated Other Comprehensive (Loss) Income
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)
2017
 
2016
 
2017
 
2016
 
Unrealized Gains on Available-for-sale Securities:
 
 
  
 
  
 
  
 
  
Realized gain for the period
$
—

 
$
(4,502
)
 
$
—

 
$
(6,256
)
 
Other income, net
  
—

 
1,801

 
—

 
2,502

 
Provision for Income Taxes
  
—

 
(2,701
)
 
—

 
(3,754
)
 
Net of Tax
Pension and Other Postretirement Plans:
  
 
  
 
 
 
  
 
  
Amortization of net prior service cost
120

 
105

 
240

 
209

 
(1)
Amortization of net actuarial (gain) loss
(1,568
)
 
289

 
(3,391
)
 
579

 
(1)
  
(1,448
)
 
394

 
(3,151
)
 
788

 
Before tax
  
579

 
(158
)
 
1,260

 
(315
)
 
Provision for Income Taxes
  
(869
)
 
236

 
(1,891
)
 
473

 
Net of Tax
Cash Flow Hedge
 
 
 
 
 
 
  
 
  
  
41

 
—

 
72

 
—

 
Interest expense
  
(8
)
 
—

 
(14
)
 
—

 
Provision for Income Taxes
  
33

 
—

 
58

 
—

 
Net of Tax
Total reclassification for the period
$
(836
)
 
$
(2,465
)
 
$
(1,833
)
 
$
(3,281
)
 
Net of Tax
____________
(1)
These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 8).