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Other Income (Expense), net (Tables)
 12 Months Ended
Dec. 31, 2015
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense)
“Other income (expense), net” consisted of the following:

 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(in thousands)
Investment income
$
4,683

 
$
6,621

 
$
4,804

Realized gain on sale of marketable securities, net
5,247

 
3,765

 
2,608

Loss on financial instrument obligations
(477
)
 
(1,820
)
 
—

Realized loss upon change to equity method at fair value
(2,807
)
 
(568
)
 
—

Realized gain on non-monetary exchange
9,268

 
—

 
—

Foreign exchange loss
(669
)
 
(1,059
)
 
—

Gain (loss) on sale of property and equipment
(235
)
 
191

 
132

Loss on extinguishment of debt
(87
)
 
—

 
(463
)
Other
(24
)
 
(72
)
 
(7
)
Other income (expense), net
$
14,899

 
$
7,058

 
$
7,074