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Other Non-Operating Income (Expense) (Tables)
 6 Months Ended
Jun. 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 
 June 30
 
Six Months Ended 
 June 30
(in thousands)
2014
 
2013
 
2014
 
2013
Gain on Berkshire marketable equity securities exchange
$
266,733

 
$
—

 
$
266,733

 
$
—

Gain on sale of headquarters building
—

 
—

 
127,670

 
—

Foreign currency gain (loss), net
2,909

 
(12,622
)
 
7,946

 
(17,236
)
(Losses) gains on sales or write-downs of marketable equity securities
(2,259
)
 
337

 
(3,044
)
 
879

Other, net
731

 
(573
)
 
2,082

 
(584
)
Total Other Non-Operating Income (Expense)
$
268,114

 
$
(12,858
)
 
$
401,387

 
$
(16,941
)