Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of the cost or amortized cost and fair value of investments in fixed maturity securities, classified as available-for-sale, by contractual maturity
Less than one year, Amortized Cost	$ 11,024
One to five years, Amortized Cost	20,300
Five to ten years, Amortized Cost	18,793
More than ten years, Amortized Cost	80,245
U.S. agency-based mortgage-backed securities, Amortized Cost	11,179
Total, Amortized Cost	141,541	98,077
Less than one year, Fair Value	11,045
One to five years, Fair Value	20,627
Five to ten years, Fair Value	19,439
More than ten years, Fair Value	84,958
U.S. agency-based mortgage-backed securities, Fair Value	11,062
Total, Fair Value	$ 147,131