Investments (Details 3) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Balance, beginning of period	$ 47,949	$ 51,578	$ 47,291	$ 47,905
Initial impairments - credit loss OTTI recognized on securities not previously impaired	1,473	1,152	1,473	2,724
Additional impairments - credit loss OTTI recognized on securities previously impaired	3,780	3,303	4,438	5,404
Credit loss impairments previously recognized on securities which were sold during the period	(718)	(2,685)	(718)	(2,685)
Balance, end of period	$ 52,484	$ 53,348	$ 52,484	$ 53,348