Other (Expense) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Income and Expenses [Abstract]
Interest and dividend income	$ 2,130	$ 1,603	$ 4,389	$ 2,126
Accretion income	640	409	1,262	521
Realized (losses) gains on the sale of investments	0	(432)	0	(833)
Total net investment income from available-for-sale securities	2,770	1,580	5,651	1,814
Interest income from investments in special purpose entities	2,003	2,018	4,005	2,018
Interest accrued on notes receivable	665	353	995	392
Total investment income, net	5,438	3,951	10,651	4,224
Interest expense and amortization of discount and issuance costs for Senior Notes issued by special purpose entity	(2,189)	(2,071)	(4,377)	(2,071)
Interest expense	(456)	(178)	(1,145)	(818)
Total interest expense	(2,645)	(2,249)	(5,522)	(2,889)
Costs for the ongoing SEC investigation	(7,430)	0	(7,430)	0
Liability For Potential Settlement Of Ongoing SEC Investigation	3,500		3,500
Accretion income from retained interest investments	227	219	438	430
Hunting lease income	169	196	378	576
Other income, net	21	155	178	341
Other, net	(7,013)	570	(6,436)	1,347
Total other (expense) income	(4,220)	$ 2,272	$ (1,307)	$ 2,682
Other Income (Expense) [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum			4.90%
Legal Fees	$ 3,900		$ 3,900
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%