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Other Non-Operating Income (Expense) (Tables)
 9 Months Ended
Sep. 30, 2014
Other Nonoperating Income (Expense) [Abstract]  
Summary of Other Non-Operating Income (Expense)
A summary of non-operating income (expense) is as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
(in thousands)
2014
 
2013
 
2014
 
2013
Gain on sale of intangible assets
$
75,249

 
$
—

 
$
75,249

 
$
—

Foreign currency (loss) gain, net
(10,564
)
 
7,886

 
(2,618
)
 
(9,350
)
Gain on Berkshire marketable equity securities exchange
—

 
—

 
266,733

 
—

Gain on sale of headquarters building
—

 
—

 
127,670

 
—

(Losses) gain on sales or write-down of marketable equity securities
—

 
—

 
(3,044
)
 
879

Other, net
(159
)
 
224

 
1,923

 
(360
)
Total Other Non-Operating Income (Expense)
$
64,526

 
$
8,110

 
$
465,913

 
$
(8,831
)