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Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive loss, net of tax
Accumulated other comprehensive loss was comprised of the following as of September 30, 2017 and December 31, 2016:
 
As of
 
September 30,
2017
 
December 31,
2016
 
(In thousands)
Foreign currency translation loss
$
(8,567
)
 
$
(22,370
)
Changes in defined benefit plan liabilities
(3,627
)
 
(3,716
)
Unrealized holding gains on available-for-sale securities
2,174

 
926

Total accumulated other comprehensive loss
$
(10,020
)
 
$
(25,160
)