Other Income (Expense), Net - Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investment income, net
Interest and dividend income		$ 6	$ 13	$ 1,117
Accretion income	$ 52	13	90	60
Net realized gain (loss) on the sale of investments			17	(48)
Unrealized (gain) loss on investments, net	63	270	(1,947)	(4,633)
Interest income from investments in SPEs	2,003	2,045	6,075	6,136
Interest earned on notes receivable and other interest	213	71	565	219
Total investment income, net	2,331	2,405	4,813	2,851
Interest expense
Interest expense and amortization of discount and issuance costs for Senior Notes issued by SPE	(2,207)	(2,204)	(6,619)	(6,609)
Other interest expense	(1,907)	(1,175)	(5,020)	(3,504)
Total interest expense	(4,114)	(3,379)	(11,639)	(10,113)
Gain on contribution to equity method investment	0	0	3,290	19,615
Other income (expense), net
Accretion income from retained interest investments	392	349	1,129	1,034
Gain on insurance recovery	2,540		3,924
Loss from hurricane damage	(11)	(594)	(26)	(1,096)
Miscellaneous income, net	4,408	512	4,568	723
Other income, net	7,329	267	9,595	661
Total other income (expense), net	$ 5,546	$ (707)	$ 6,059	$ 13,014