Investments (Tables)

9 Months Ended

Sep. 30, 2021

Investments [Abstract]

Summary of investments

The following tables summarize our investments as of September 30, 2021, and December 31, 2020 (in thousands):

	September 30, 2021
	Cost		Unrealized Gains (Losses)		Carrying Amount
Publicly traded companies	$	282,816	$	374,515	$	657,331
Entities that report NAV	355,400		480,412		835,812
Entities that do not report NAV:
Entities with observable price changes	54,562		74,906		129,468
Entities without observable price changes	349,100		—		349,100
	$	1,041,878	$	929,833	1,971,711
Investments accounted for under the equity method					75,167
Total investments					$	2,046,878

	December 31, 2020
	Cost		Unrealized Gains (Losses)		Carrying Amount
Publicly traded companies	$	208,754	$	351,076	$	559,830
Entities that report NAV	334,341		327,741		662,082
Entities that do not report NAV:
Entities with observable price changes	47,545		96,859		144,404
Entities without observable price changes	244,798		—		244,798
Total investments	$	835,438	$	775,676	$	1,611,114

Schedule of net investment income

Our investment income for the three and nine months ended September 30, 2021 and 2020, consisted of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Realized gains	$	81,516	$	17,361	$	189,013	$	25,689
Unrealized (losses) gains	(14,432)		(14,013)		183,348		140,495
Investment income	$	67,084	$	3,348	$	372,361	$	166,184