Other Income (Expense) - Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investment income, net
Interest and dividend income	$ 1,637	$ 1,802	$ 5,752	$ 7,025
Accretion income		218	84	641
Net realized gain (loss) on the sale of investments	28	125	26	(961)
Other-than-temporary impairment loss		(1,660)		(1,723)
Unrealized (loss) gain on investments, net	(1,439)	(89)	(1,305)	641
Interest income from investments in SPEs	2,047	2,049	6,143	6,148
Interest accrued on notes receivable and other interest	98	130	252	450
Total investment income, net	2,371	2,575	10,952	12,221
Interest expense
Interest expense and amortization of discount and issuance costs for Senior Notes issued by SPE	(2,201)	(2,197)	(6,599)	(6,590)
Other interest expense	(908)	(729)	(2,476)	(2,315)
Total interest expense	(3,109)	(2,926)	(9,075)	(8,905)
Other income (expense), net
Gain on land contribution to equity method investment	846		2,317
Accretion income from retained interest investments	335	316	982	909
Insurance proceeds	1,243		5,314
Hurricane expense	(575)		(1,703)
Miscellaneous income (expense), net	298	(48)	216	(122)
Other income, net	2,147	268	7,126	787
Total other income (expense), net	$ 1,409	$ (83)	$ 9,003	$ 4,103