Other Income (Expense) - Other income (expense) summary (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Investment income, net
Interest and dividend income	$ 189	$ 2,257
Accretion income	464	621
Total net investment income from available-for-sale securities	653	2,878
Interest income from investments in special purpose entities	2,050	2,003
Interest accrued on notes receivable and other interest	27	331
Total investment income, net	2,730	5,212
Interest expense
Interest expense and amortization of discount and issuance costs for Senior Notes issued by special purpose entity	(2,190)	(2,188)
Interest expense	(845)	(688)
Total interest expense	(3,035)	(2,876)
Claim settlement	12,548	0
Other income, net
Accretion income from retained interest investments	241	211
Hunting lease income	199	210
Other income, net	12	156
Other income, net	452	577
Total other income	$ 12,695	$ 2,913