Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2019

Investments in Debt and Equity Securities

Summary of debt and equity securities

	Gross Unrealized
	(dollars in thousands)
							Fair
June 30, 2019	Cost		Gains		Losses		Value
Equity	$	255,339	$	115,977	$	(6,337)	$	364,979
Debt		287,991		8,400		(888)		295,503
Other		7,848		—		—		7,848
Total	$	551,178	$	124,377	$	(7,225)	$	668,330

	Gross Unrealized
	(dollars in thousands)
							Fair
December 31, 2018	Cost		Gains		Losses		Value
Equity	$	251,226	$	64,954	$	(9,105)	$	307,075
Debt		278,030		1,718		(4,955)		274,793
Other		3,075		—		—		3,075
Total	$	532,331	$	66,672	$	(14,060)	$	584,943