Other Income, Net - Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investment income, net
Interest and dividend income	$ 1	$ 67	$ 13	$ 1,111
Accretion income	26	30	38	47
Net realized gain (loss) on the sale of investments			17	(48)
Unrealized loss on investments, net	(960)	(142)	(2,010)	(4,903)
Interest income from investments in SPEs	2,029	2,045	4,072	4,091
Interest earned on notes receivable and other interest	191	55	352	148
Total investment income, net	1,287	2,055	2,482	446
Interest expense
Interest expense and amortization of discount and issuance costs for Senior Notes issued by SPE	(2,206)	(2,203)	(4,412)	(4,405)
Other interest expense	(1,648)	(1,187)	(3,113)	(2,329)
Total interest expense	(3,854)	(3,390)	(7,525)	(6,734)
Gain on contribution to equity method investment	3,169	15,338	3,290	19,616
Other income (expense), net
Accretion income from retained interest investments	376	340	737	685
Gain on insurance recovery	518		1,384
Loss from hurricane damage	(8)	(447)	(15)	(502)
Miscellaneous income, net	86	246	160	210
Other income, net	972	139	2,266	393
Total other income, net	$ 1,574	$ 14,142	$ 513	$ 13,721