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Other Non-Operating Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2014
Other Nonoperating Income (Expense) [Abstract]  
Summary of Other Non-Operating Income (Expense)
A summary of non-operating income (expense) is as follows:
 
Year Ended December 31
(in thousands)
2014
 
2013
 
2012
Gain on sale of Classified Ventures
$
396,553

 
$
—

 
$
—

Gain on Berkshire marketable equity securities exchange
266,733

 
—

 
—

Gain on sale of headquarters building
127,670

 
—

 
—

Gain on sale of intangible assets
75,249

 
—

 
—

Foreign currency (losses) gains, net
(11,129
)
 
(13,382
)
 
3,132

(Losses) gain on sales or write-down of marketable equity securities
(3,044
)
 
(9,559
)
 
(17,564
)
(Losses) gains on sales or write-downs of cost method investments, net
(94
)
 
(1,761
)
 
6,639

Other, net
1,321

 
951

 
2,337

Total Other Non-Operating Income (Expense)
$
853,259

 
$
(23,751
)
 
$
(5,456
)