Investments (Tables)

6 Months Ended

Jun. 30, 2016

Investments [Abstract]

Investments in Marketable Equity Securities

Investments in marketable equity securities comprised the following:

	As of
	June 30, 2016			December 31, 2015
(in thousands)
Total cost	$	254,352		$	253,062
Gross unrealized gains	95,490			97,741
Gross unrealized losses	(9,209		)	(240		)
Total Fair Value	$	340,633		$	350,563