Subsequent Events (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Oct. 31, 2013 [SubsequentEventMember]	Sep. 30, 2013 [SubsequentEventMember]
Subsequent Event [Line Items]
Other invested assets	$ 268,097	$ 333,361	$ 105,000	$ 36,000
Subsequent Events Date			Oct. 30, 2013