Investments (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of other invested assets
Land	$ 10,993	$ 10,993
Land improvements	1,328	1,326
Building	2,869	2,869
Other	1,303	1,238
Total, at cost	16,493	16,426
Less: accumulated depreciation and amortization	(434)	(339)
Other investments	$ 16,059	$ 16,087