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Investments (Tables)
6 Months Ended
Jun. 30, 2014
Investments [Abstract]  
Investments in Marketable Equity Securities
Investments in marketable equity securities comprised the following:
  
As of
  
June 30,
2014
 
December 31,
2013
(in thousands)
 
Total cost
$
56,967

 
$
197,718

Net unrealized gains
60,569

 
289,438

Total Fair Value
$
117,536

 
$
487,156