Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2018

Investments in Debt and Equity Securities

Summary of debt and equity securities

		Gross Unrealized
		(dollars in thousands)
June 30, 2018		Cost		Gains		Losses			Fair Value
Equity	$	248,817	$	96,340	$	(4,885	)	$	340,272
Debt		253,860		694		(5,087	)		249,467
Other		8,645		—		—			8,645
Total	$	511,322	$	97,034	$	(9,972	)	$	598,384

		Gross Unrealized
		(dollars in thousands)
December 31, 2017		Cost		Gains		Losses			Fair Value
Equity	$	246,549	$	91,954	$	(4,064	)	$	334,439
Debt		240,878		1,814		(2,262	)		240,430
Other		10,807		1		—			10,808
Total	$	498,234	$	93,769	$	(6,326	)	$	585,677