Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments in Debt and Equity Securities

Summary of activities for available-for-sale securities

		Gross Unrealized
		(dollars in thousands)
June 30, 2015		Cost		Gains		Losses			Fair Value
Equity	$	225,613	$	45,528	$	(3,455	)	$	267,686
Debt		178,312		1,895		(2,328	)		177,879
Other		12,506		—		(2	)		12,504
Total	$	416,431	$	47,423	$	(5,785	)	$	458,069

		Gross Unrealized
		(dollars in thousands)
December 31, 2014		Cost		Gains		Losses			Fair Value
Equity	$	200,892	$	69,536	$	(2,163	)	$	268,265
Debt		168,182		9,981		(8,619	)		169,544
Other		13,927		—		(4	)		13,923
Total	$	383,001	$	79,517	$	(10,786	)	$	451,732