Investments (Tables)

9 Months Ended

Sep. 30, 2016

Investments [Abstract]

Investments in Marketable Equity Securities

Investments in marketable equity securities comprised the following:

	As of
	September 30, 2016			December 31, 2015
(in thousands)
Total cost	$	284,343		$	253,062
Gross unrealized gains	107,145			97,741
Gross unrealized losses	(8,711		)	(240		)
Total Fair Value	$	382,777		$	350,563