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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Summary of Other Comprehensive (Loss) Income
The other comprehensive income consists of the following components:
 
Three Months Ended September 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
$
11,470

 
$
—

 
$
11,470

 
$
(353
)
 
$
—

 
$
(353
)
Unrealized gains on available-for-sale securities:
 
 
  
 
  
 
  
 
  
 
  
Unrealized gains for the period, net
47,836

 
(19,134
)
 
28,702

 
12,154

 
(4,862
)
 
7,292

Pension and other postretirement plans:
  
 
  
 
  
 
  
 
  
 
  
Amortization of net prior service cost included in net income
118

 
(47
)
 
71

 
105

 
(41
)
 
64

Amortization of net actuarial (gain) loss included in net income
(1,567
)
 
627

 
(940
)
 
289

 
(116
)
 
173

 
(1,449
)
 
580

 
(869
)
 
394

 
(157
)
 
237

Cash flow hedge:
  
 
  
 
  
 
  
 
  
 
  
(Loss) gain for the period
(72
)
 
14

 
(58
)
 
49

 
(20
)
 
29

Other Comprehensive Income
$
57,785

 
$
(18,540
)
 
$
39,245

 
$
12,244

 
$
(5,039
)
 
$
7,205

  
Nine Months Ended September 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
$
34,776

 
$
—

 
$
34,776

 
$
(1,629
)
 
$
—

 
$
(1,629
)
Unrealized gains on available-for-sale securities:
 
 
  
 
  
 
 
 
  
 
  
Unrealized gains for the period, net
71,370

 
(28,548
)
 
42,822

 
7,190

 
(2,876
)
 
4,314

Reclassification of realized gain on sale of available-for-sale securities included in net income
—

 
—

 
—

 
(6,256
)
 
2,502

 
(3,754
)
  
71,370

 
(28,548
)
 
42,822

 
934

 
(374
)
 
560

Pension and other postretirement plans:
  
 
  
 
  
 
  
 
  
 
  
Amortization of net prior service cost included in net income
358

 
(143
)
 
215

 
314

 
(125
)
 
189

Amortization of net actuarial (gain) loss included in net income
(4,958
)
 
1,983

 
(2,975
)
 
868

 
(347
)
 
521

  
(4,600
)
 
1,840

 
(2,760
)
 
1,182

 
(472
)
 
710

Cash flow hedge:
 
 
  
 
  
 
  
 
  
 
  
(Loss) gain for the period
(215
)
 
43

 
(172
)
 
49

 
(20
)
 
29

Other Comprehensive Income
$
101,331

 
$
(26,665
)
 
$
74,666

 
$
536

 
$
(866
)
 
$
(330
)
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
34,776

 
42,822

 
—

 
(270
)
 
77,328

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

 
—

 
(2,760
)
 
98

 
(2,662
)
Other comprehensive income (loss), net of tax
34,776

 
42,822

 
(2,760
)
 
(172
)
 
74,666

Balance as of September 30, 2017
$
7,778

 
$
135,753

 
$
168,070

 
$
(449
)
 
$
311,152
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 
 September 30
 
Nine Months Ended 
 September 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
$
—

 
$
—

 
$
—

 
$
(6,256
)
 
Other income (expense), net
  
—

 
—

 
—

 
2,502

 
Provision for Income Taxes
  
—

 
—

 
—

 
(3,754
)
 
Net of Tax
Pension and Other Postretirement Plans:
  
 
  
 
 
 
  
 
  
Amortization of net prior service cost
118

 
105

 
358

 
314

 
(1)
Amortization of net actuarial (gain) loss
(1,567
)
 
289

 
(4,958
)
 
868

 
(1)
  
(1,449
)
 
394

 
(4,600
)
 
1,182

 
Before tax
  
580

 
(157
)
 
1,840

 
(472
)
 
Provision for Income Taxes
  
(869
)
 
237

 
(2,760
)
 
710

 
Net of Tax
Cash Flow Hedge
 
 
 
 
 
 
  
 
  
  
51

 
(3
)
 
123

 
(3
)
 
Interest expense
  
(11
)
 
1

 
(25
)
 
1

 
Provision for Income Taxes
  
40

 
(2
)
 
98

 
(2
)
 
Net of Tax
Total reclassification for the period
$
(829
)
 
$
235

 
$
(2,662
)
 
$
(3,046
)
 
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).