Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Income and Expenses [Abstract]
Interest and dividend income	$ 1,859	$ 482	$ 3,987	$ 750
Accretion income	440	0	961	0
Realized (losses) gains on the sale of investments	0	93	(833)	93
Other-than-temporary impairment losses	(1,295)	0	(1,295)	0
Total net investment income from available-for-sale securities	1,004	575	2,820	843
Interest income from investments in special purpose entities	2,050	0	4,067	0
Interest accrued on notes receivable	313	20	705	165
Total investment income, net	3,367	595	7,592	1,008
Interest expense and amortization of discount and issuance costs for Senior Notes issued by special purpose entity	(2,185)	0	(4,397)	0
Interest expense	(765)	(524)	(1,442)	(1,392)
Total interest expense	(2,950)	(524)	(5,839)	(1,392)
Accretion income from retained interest investments	226	207	656	589
Hunting lease income	138	430	623	1,290
Other income, net	23	269	455	371
Other, net	387	906	1,734	2,250
Total other income	$ 804	$ 977	$ 3,487	$ 1,866