Investments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fixed Maturity Securities
Taxable	$ 24,385	$ 28,330	$ 75,407	$ 86,548
Exempt from U.S. income taxes	28,988	27,291	85,063	80,163
Total fixed maturity securities	53,373	55,621	160,470	166,711
Equity securities	2,950	1,346	10,758	2,339
Short-term investments	42	295	122	397
Other investment income	31	831	350	1,699
Total investment income	56,396	58,093	171,700	171,146
Investment expense	(2,188)	(1,751)	(6,059)	(4,504)
Net investment income	$ 54,208	$ 56,342	$ 165,641	$ 166,642