Investments in Debt and Equity Securities (Tables)

3 Months Ended

Mar. 31, 2017

Investments in Debt and Equity Securities

Summary of available-for-sale securities

		Gross Unrealized
		(dollars in thousands)
March 31, 2017		Cost		Gains		Losses			Fair Value
Equity	$	248,135	$	47,893	$	(3,936	)	$	292,092
Debt		213,015		1,456		(2,815	)		211,656
Other		2,718		—		—			2,718
Total	$	463,868	$	49,349	$	(6,751	)	$	506,466

		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