Investments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other than temporary impairment credit losses
Total other-than-temporary impairment loss	$ (686)	$ 0	$ (2,069)	$ (4,677)
Portion recognized in other comprehensive income	55	0	1,041	1,198
Net other-than-temporary impairment loss recognized in earnings	(631)	0	(1,028)	(3,479)
Credit losses recognized in earnings with component in other comprehensive income
Balance at beginning of period	5,444	3,847	5,047	4,273
Securities previously impaired	631	0	899	1,597
Securities previously not impaired	0	0	129	1,882
Securities sold		0		(3,905)
Balance at end of period	$ 6,075	$ 3,847	$ 6,075	$ 3,847