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Investments (Tables)
12 Months Ended
Dec. 31, 2014
Investments [Abstract]  
Investments in Marketable Equity Securities
Investments in marketable equity securities consist of the following:
 
As of December 31
(in thousands)
2014
 
2013
Total cost
$
106,909

 
$
197,718

Net unrealized gains
86,884

 
289,438

Total Fair Value
$
193,793

 
$
487,156