Investments (Tables)

12 Months Ended

Dec. 31, 2017

Investments [Abstract]

Investments in Marketable Equity Securities

Investments in marketable equity securities consist of the following:

	As of December 31
(in thousands)	2017		2016
Total cost	$	269,343	$	269,343
Gross unrealized gains	266,972		154,886
Total Fair Value	$	536,315	$	424,229