Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investment income, net
Interest and dividend income	$ 1,528	$ 1,120	$ 1,969	$ 5,509
Accretion income	960	639	2,002	2,184
Realized gains on the sale of investments	40	5,276	40	5,276
Total net investment income from available-for-sale securities	2,528	7,035	4,011	12,969
Interest income from investments in special purpose entities	2,051	2,050	6,151	6,150
Interest accrued on notes receivable and other interest	110	40	216	657
Total investment income, net	4,689	9,125	10,378	19,776
Interest expense
Interest expense and amortization of discount and issuance costs for Senior Notes issued by special purpose entity	(2,259)	(2,189)	(6,640)	(6,566)
Interest expense	(816)	(686)	(2,615)	(1,831)
Total interest expense	(3,075)	(2,875)	(9,255)	(8,397)
Claim settlement	0	0	12,548	0
Other, net
Fees and expenses for the SEC investigation	0	(438)	0	(7,869)
Accretion income from retained interest investments	249	237	733	674
Hunting lease income	138	135	415	425
Other income, net	48	201	339	468
Other, net	435	135	1,487	(6,302)
Total other income	$ 2,049	$ 6,385	$ 15,158	$ 5,077