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Other Income (Expense), net (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense)
“Other income (expense), net” consisted of the following:

 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(in thousands)
Investment income
$
6,621

 
$
4,804

 
$
1,903

Realized gain on sale of marketable securities, net
3,765

 
2,608

 
282

Realized loss on financial instrument obligation
(1,821
)
 
—

 
—

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

 
—

Foreign exchange loss
(1,059
)
 
—

 
—

Gain (loss) on sale of property and equipment
191

 
132

 
(819
)
Loss on extinguishment of debt
—

 
(463
)
 
—

Other
(71
)
 
(7
)
 
(299
)
Other income (expense), net
$
7,058

 
$
7,074

 
$
1,067