Net Investment Income (Tables)

12 Months Ended

Dec. 31, 2019

Net Investment Income [Abstract]

Schedule of Net Investment Income

The components of net investment income are summarized as follows:

	Year ended December 31,
	2019			2018			2017
	(in thousands)
Interest on:
Cash, cash equivalents and deposits with banks	$	26,187		$	21,910		$	7,321
Debt securities		163,339			138,409			104,458
Other investments		96,812			64,328			22,221
Dividends on equity securities		12,092			12,718			12,925
Deferred compensation plan assets		17,274			(6,399	)		14,211
Equity in earnings of affiliates, net		2,836			2,717			3,785
Other		612			106			607
Total investment income		319,152			233,789			165,528
Investment expenses		(3,739	)		(3,500	)		(3,126	)
Net investment income	$	315,413		$	230,289		$	162,402