Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2017

Investments in Debt and Equity Securities

Summary of available-for-sale securities

		Gross Unrealized
		(dollars in thousands)
September 30, 2017		Cost		Gains		Losses			Fair Value
Equity	$	251,021	$	75,181	$	(4,386	)	$	321,816
Debt		224,458		2,194		(1,769	)		224,883
Other		6,604		1		—			6,605
Total	$	482,083	$	77,376	$	(6,155	)	$	553,304

		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