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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2016
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in accumulated other comprehensive loss, net of taxes by component for the nine months ended September 30, 2016 (in thousands):
 
Unrecognized Benefit Plan Gains and Losses
 
Foreign Currency Translation Adjustments
 
Unrealized Holding Gain on Marketable Securities
 
Total
Balance at December 31, 2015
$
(57,391
)
 
$
(15,764
)
 
$
2,139

 
$
(71,016
)
Other comprehensive income
3,539

 
2,002

 
1,591

 
7,132

Balance at September 30, 2016
$
(53,852
)
 
$
(13,762
)
 
$
3,730

 
$
(63,884
)