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OTHER INCOME(LOSS):
 6 Months Ended
Jun. 30, 2016
Other Income and Expenses [Abstract]  
OTHER INCOME (LOSS):
OTHER INCOME (LOSS):
Other income (loss) is summarized in the following table:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Interest income and gains (losses) on sale of investments, net
$
674

 
$
817

 
$
744

 
$
1,480

Impairment loss on equity investment in a private company
—

 
—

 
—

 
(3,189
)
Foreign exchange gain (loss)
(359
)
 
95

 
(368
)
 
152

Other income (loss)
$
315

 
$
912

 
$
376

 
$
(1,557
)