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Accumulated Other Comprehensive (Loss) Income
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive (Loss) Income
I.    
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
Changes in accumulated other comprehensive (loss) income, which is presented net of tax, consist of the following:
 
 
 
Foreign
Currency
Translation
Adjustment
 
 
Unrealized
Gains
(Losses)
 on
Marketable
Securities
 
 
Retirement
Plans
 Prior
Service
Credit
 
 
Total
 
 
 
(in thousands)
 
Balance at December 31, 2016, net of tax of $0, $209, $(778)
 
$
(21,921
)
 
$
(60
)
 
$
1,767
 
 
$
(20,214
)
Other comprehensive income before reclassifications, net of tax of $0, $1,903, $0
 
 
37,840
 
 
 
1,863
 
 
 
—
 
 
 
39,703
 
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(297), $(154)
 
 
—
 
 
 
(441
)
 
 
(272
)
 
 
(713
)
Net current period other comprehensive income, net of tax of $0, $1,606, $(154)
 
 
37,840
 
 
 
1,422
 
 
 
(272
)
 
 
38,990
 
Balance at December 31, 2017, net of tax of $0, $1,815, $(932)
 
 
15,919
 
 
 
1,362
 
 
 
1,495
 
 
 
18,776
 
Other comprehensive loss before 
reclassifications, net of tax of $0, $(722), $0
 
 
(28,442
)
 
 
(2,110
)
 
 
—
 
 
 
(30,552
)
Amounts reclassified from accumulated other
 comprehensive income, net of tax of $0, $(21), $(71)
 
 
—
 
 
 
1,337
 
 
 
(245
)
 
 
1,092
 
Net current period other comprehensive loss,
 net of tax of $0, $(743), $(71)
 
 
(28,442
)
 
 
(773
)
 
 
(245
)
 
 
(29,460
)
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $0, $(691), $(78), respectively (a)
 
 
—
 
 
 
691
 
 
 
78
 
 
 
769
 
Reclassification of unrealized gains on equity securities, net of tax of $0, $(902), $0, respectively, (b)
 
 
—
 
 
 
(3,125
)
 
 
—
 
 
 
(3,125
)
Balance at December 31, 2018, net of tax of $0, $(521), $(1,081)
 
$
(12,523
)
 
$
(1,845
)
 
$
1,328
 
 
$
(13,040
)
 
 
(a)
In the year ended December 31, 2018, Teradyne early adopted ASU 2018-02,
“Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.”
As a result, the stranded tax effects resulting from the Tax Reform Act enacted in December 2017 were reclassified from accumulated other comprehensive income to retained earnings.
(b)
In the year ended December 31, 2018, Teradyne adopted ASU 2016-01, “
Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities
.” See Note B: “Accounting Policies.”
Reclassifications out of accumulated other comprehensive income to the statements of operations for the years ended December 31, 2018, 2017, and 2016 were as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Details about Accumulated
Other Comprehensive Income 
Components
  
For the year ended
 
  
Affected Line Item
in the Statements
of Operations
 
 
  
December 31,
2018
 
  
December 31,
2017
 
  
December 31,
2016
 
  
 
 
 
  
(in thousands)
 
  
 
 
Available-for-sale marketable securities
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Unrealized (losses) gains, net of tax of $21, $297, $255
  
$
(1,337
) 
  
$
441
 
  
$
683
 
  
 
Interest income
(expense)
 
 
Defined benefit pension and postretirement plans:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Amortization of prior service benefit, net of tax of $71, $154, $190
  
 
245
 
  
 
272
 
  
 
321
 
  
 
(a)
 
Total reclassifications, net of tax of $92, $451, $445
  
$
(1,092
) 
  
$
713
 
  
$
1,004
 
  
 
Net income
 
 
(a)
The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note N: “Retirement Plans.”