Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments in Debt and Equity Securities

Summary of activities for available-for-sale securities

		Gross Unrealized
		(dollars in thousands)
June 30, 2016		Cost		Gains		Losses			Fair Value
Equity	$	233,116	$	41,280	$	(8,644	)	$	265,752
Debt		193,497		5,209		(1,273	)		197,433
Other		7,395		—		(1	)		7,394
Total	$	434,008	$	46,489	$	(9,918	)	$	470,579

		Gross Unrealized
		(dollars in thousands)
December 31, 2015		Cost		Gains		Losses			Fair Value
Equity	$	230,123	$	37,494	$	(9,635	)	$	257,982
Debt		189,700		1,158		(3,491	)		187,367
Other		5,255		—		(4	)		5,251
Total	$	425,078	$	38,652	$	(13,130	)	$	450,600