Investments (Allowance for Losses) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012		Dec. 31, 2011
Allowance For Losses On Commermcial Mortgage And Other Loans [Line Items]
Allowance for Losses, Beginning Balance	$ 1,501	[1]	$ 2,980
Addition To / (Release of) Allowance For Losses	587		(1,479)
Allowance for Losses, Ending Balance	2,088	[1]	1,501	[1]
Agricultural Property Loans [Member]
Allowance For Losses On Commermcial Mortgage And Other Loans [Line Items]
Allowance for Losses, Ending Balance	$ 200		$ 200

[1] (1) Agricultural loans represent $0.2 million of the ending allowance at both September 30, 2012 and December 31, 2011.