Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2017

Investments in Debt and Equity Securities

Summary of available-for-sale securities

		Gross Unrealized
		(dollars in thousands)
June 30, 2017		Cost		Gains		Losses			Fair Value
Equity	$	250,191	$	61,721	$	(4,562	)	$	307,350
Debt		221,630		2,161		(2,063	)		221,728
Other		3,710		1		—			3,711
Total	$	475,531	$	63,883	$	(6,625	)	$	532,789

		Gross Unrealized
		(dollars in thousands)
December 31, 2016		Cost		Gains		Losses			Fair Value
Equity	$	237,317	$	51,054	$	(5,041	)	$	283,330
Debt		201,492		1,167		(3,423	)		199,236
Other		3,339		—		(2	)		3,337
Total	$	442,148	$	52,221	$	(8,466	)	$	485,903