Investments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fixed Maturity Securities
Taxable	$ 28,330	$ 30,009	$ 86,548	$ 84,228
Exempt from U.S. income taxes	27,291	24,887	80,163	74,713
Total fixed maturity securities	55,621	54,896	166,711	158,941
Equity Securities	1,346		2,339
Short-term investments	295	99	397	420
Other	831	962	1,699	2,992
Total investment income	58,093	55,957	171,146	162,353
Investment expense	1,751	1,192	4,504	3,571
Net investment income	$ 56,342	$ 54,765	$ 166,642	$ 158,782