Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments in Debt and Equity Securities

Summary of debt and equity securities

	Gross Unrealized
	(dollars in thousands)
							Fair
September 30, 2018	Cost		Gains		Losses		Value
Equity	$	249,762	$	111,570	$	(4,682)	$	356,650
Debt		274,110		573		(6,073)		268,610
Other		1,520		—		—		1,520
Total	$	525,392	$	112,143	$	(10,755)	$	626,780

	Gross Unrealized
	(dollars in thousands)
							Fair
December 31, 2017	Cost		Gains		Losses		Value
Equity	$	246,549	$	91,954	$	(4,064)	$	334,439
Debt		240,878		1,814		(2,262)		240,430
Other		10,807		1		—		10,808
Total	$	498,234	$	93,769	$	(6,326)	$	585,677