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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments [Abstract]  
Investments in Marketable Equity Securities
Investments in marketable equity securities consist of the following:
 
As of December 31
(in thousands)
2016
 
2015
Total cost
$
269,343

 
$
253,062

Gross unrealized gains
154,886

 
97,741

Gross unrealized losses
—

 
(240
)
Total Fair Value
$
424,229

 
$
350,563