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Other Income (Expense), net (Tables)
 6 Months Ended
Jun. 30, 2015
Income Statement [Abstract]  
Schedule of Other Income (Expense), Net
"Other income (expense), net" consisted of the following:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Investment income
$
921

 
$
1,310

 
$
2,485

 
$
2,899

Realized gain on sales of marketable securities, net
1,828

 
2,076

 
1,963

 
5,067

Realized loss on financial instrument obligations
(97
)
 
(669
)
 
(283
)
 
(669
)
Realized loss upon change to equity method at fair value
—

 
(568
)
 
(2,807
)
 
(568
)
Foreign exchange gain (loss)
91

 
(171
)
 
(197
)
 
(171
)
Other
258

 
(14
)
 
111

 
(77
)
Other income (expense), net
$
3,001

 
$
1,964

 
$
1,272

 
$
6,481