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Other Income (Expense), net
 9 Months Ended
Sep. 30, 2015
Income Statement [Abstract]  
Other Income (Expense), net
Other Income (Expense), net

"Other income (expense), net" consisted of the following:

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Investment income
$
1,019

 
$
1,332

 
$
3,504

 
$
4,231

Realized gain (loss) on sales of marketable securities, net
(3,393
)
 
(1,002
)
 
(1,430
)
 
4,065

Realized gain (loss) on financial instrument obligations
1,346

 
(83
)
 
1,063

 
(752
)
Realized loss upon change to equity method at fair value
—

 
—

 
(2,807
)
 
(568
)
Realized gain on non-monetary exchange
9,326

 
—

 
9,326

 
—

Foreign exchange loss
(295
)
 
(223
)
 
(492
)
 
(394
)
Other
(98
)
 
9

 
13

 
(68
)
Other income (expense), net
$
7,905

 
$
33

 
$
9,177

 
$
6,514