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

 
$
197,718

Net unrealized gains
70,303

 
289,438

Total Fair Value
$
127,270

 
$
487,156