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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments [Abstract]  
Investments in Marketable Equity Securities
Investments in marketable equity securities consist of the following:
 
As of December 31
(in thousands)
2015
 
2014
Total cost
$
253,062

 
$
106,909

Gross unrealized gains
97,741

 
86,884

Gross unrealized losses
(240
)
 
—

Total Fair Value
$
350,563

 
$
193,793