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Interest and Other Income (Tables)
 6 Months Ended
Jun. 30, 2014
Income Statement [Abstract]  
Schedule of Interest Income, Net
“Interest income, net” consisted of the following:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Interest income
$
1,310

 
$
1,330

 
$
2,899

 
$
2,124

Interest expense
(822
)
 
(84
)
 
(1,690
)
 
(255
)
Interest income, net
$
488

 
$
1,246

 
$
1,209

 
$
1,869
Schedule of Other Income (Expense), Net
"Other income (expense), net" consisted of the following:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Realized gain (loss) on sale of marketable securities, net
$
2,076

 
$
(1,245
)
 
$
5,067

 
$
(29
)
Realized loss on financial instrument obligation
(669
)
 
—

 
(669
)
 
—

Realized loss upon change to equity method at fair value
(568
)
 
—

 
(568
)
 
—

Other
(185
)
 
(33
)
 
(248
)
 
(110
)
Other income (expense), net
$
654

 
$
(1,278
)
 
$
3,582

 
$
(139
)