Investments (Tables)

6 Months Ended

Jun. 30, 2017

Investments [Abstract]

Investments in Marketable Equity Securities

Investments in marketable equity securities comprised the following:

	As of
	June 30, 2017		December 31, 2016
(in thousands)
Total cost	$	269,343	$	269,343
Gross unrealized gains	178,420		154,886
Total Fair Value	$	447,763	$	424,229