Investments (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of other invested assets
Total, at cost	$ 15,790	$ 6,543
Less accumulated depreciation and amortization	(154)	(60)
Other investments	15,636	6,483
Building [Member]
Summary of other invested assets
Total, at cost	2,788	1,418
Land [Member]
Summary of other invested assets
Total, at cost	10,619	4,438
Land improvements [Member]
Summary of other invested assets
Total, at cost	1,307	283
Other [Member]
Summary of other invested assets
Total, at cost	$ 1,076	$ 404