Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Income and Expenses [Abstract]
Interest and dividend income	$ 2,257	$ 524
Accretion income	621	112
Realized (losses) gains on the sale of investments	0	(401)
Total net investment income from available-for-sale securities	2,878	235
Interest income from investments in special purpose entities	2,003	0
Interest accrued on notes receivable	331	39
Total investment income, net	5,212	274
Interest expense and amortization of discount and issuance costs for Senior Notes issued by special purpose entity	(2,188)	0
Interest expense	(688)	(639)
Total interest expense	(2,876)	(639)
Accretion income from retained interest investments	211	211
Hunting lease income	210	380
Other income, net	156	185
Other, net	577	776
Total other income	$ 2,913	$ 411
Other Income (Expense) [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum	4.90%
Minimum
Other Income (Expense) [Line Items]
Discount Rate On Retained Interest	3.70%
Maximum
Other Income (Expense) [Line Items]
Discount Rate On Retained Interest	11.60%