Investments (Loan Valuation Allowance for Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance For Loan And Lease Losses Roll Forward
Balance, Beginning of Period	$ 7,903	$ 11,011	$ 11,580	$ 11,793
Charge-offs	0	(526)	(2,148)	(4,595)
Provision (release)	(234)	2,848	(1,763)	6,135
Balance, End of Period	$ 7,669	$ 13,333	$ 7,669	$ 13,333