Investments in Debt and Equity Securities (Tables)

3 Months Ended

Mar. 31, 2013

Investments in Debt and Equity Securities

Summary of activities for available-for-sale securities

	Gross Unrealized
		(dollars in thousands)
March 31, 2013		Cost		Gains		Losses			Fair Value
Equity	$	157,649	$	57,796	$	(3,288	)	$	212,157
Debt		166,551		9,691		(4,962	)		171,280
Other		11,028		—		—			11,028
Total	$	335,228	$	67,487	$	(8,250	)	$	394,465

	Gross Unrealized
		(dollars in thousands)
December 31, 2012		Cost		Gains		Losses			Fair Value
Equity	$	153,846	$	45,071	$	(3,675	)	$	195,242
Debt		163,127		10,286		(4,501	)		168,912
Other		13,654		—		—			13,654
Total	$	330,627	$	55,357	$	(8,176	)	$	377,808