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Investments (Tables)
3 Months Ended
Mar. 31, 2014
Investments [Abstract]  
Investments in Marketable Equity Securities
Investments in marketable equity securities comprised the following:
  
As of
  
March 31,
2014
 
December 31,
2013
(in thousands)
 
Total cost
$
192,736

 
$
197,718

Net unrealized gains
317,961

 
289,438

Total Fair Value
$
510,697

 
$
487,156