Other Income (Expense) - Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investment income, net
Interest and dividend income	$ 2,302	$ 2,342	$ 4,115	$ 5,222
Accretion income	23	202	84	423
Net realized loss on the sale of investments		(8)	(2)	(1,086)
Other-than-temporary impairment loss				(63)
Unrealized (loss) gain on investments, net	(1,915)	1,267	133	729
Interest income from investments in SPEs	2,048	2,049	4,096	4,099
Interest accrued on notes receivable and other interest	77	129	154	322
Total investment income, net	2,535	5,981	8,580	9,646
Interest expense
Interest expense and amortization of discount and issuance costs for Senior Notes issued by SPE	(2,200)	(2,197)	(4,399)	(4,393)
Other interest expense	(824)	(757)	(1,567)	(1,586)
Total interest expense	(3,024)	(2,954)	(5,966)	(5,979)
Other income (expense), net
Gain on land contribution to equity method investment			1,472
Accretion income from retained interest investments	327	303	647	593
Insurance proceeds	3,792		4,071
Hurricane expense	(805)		(1,127)
Miscellaneous expense, net	(31)	(60)	(84)	(73)
Other income, net	3,283	243	4,979	520
Total other income, net	$ 2,794	$ 3,270	$ 7,593	$ 4,187