Investments (Details 5) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Realized pretax gains-losses-on the sale of investments excluding temporary impairment losses
Gains	$ 4,099	$ 2,692	$ 4,319	$ 7,595
Losses	(3,045)	(377)	(3,824)	(755)
Net realized investment gain (loss)	1,054	2,315	495	6,840
Fixed income securities [Member]
Realized pretax gains-losses-on the sale of investments excluding temporary impairment losses
Gains	4,099	2,692	4,315	7,593
Losses	(3,035)	(376)	(3,814)	(599)
Net fixed income securities	1,064	2,316	501	6,994
Other Investments [Member]
Realized pretax gains-losses-on the sale of investments excluding temporary impairment losses
Gains			4	2
Losses	(10)	(1)	(10)	(156)
Net other investments	$ (10)	$ (1)	$ (6)	$ (154)