Investments (Allowance for Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance For Losses On Commermcial Mortgage And Other Loans [Line Items]
Allowance for Losses, Beginning Balance	$ 1,256	[1]	$ 2,177		$ 1,501
Addition To / (Release of) Allowance For Losses	(774)		(921)		676
Allowance for Losses, Ending Balance	482	[1]	1,256	[1]	2,177
Agricultural Property Loans [Member]
Allowance For Losses On Commermcial Mortgage And Other Loans [Line Items]
Allowance for Losses, Ending Balance	$ 100		$ 100		$ 200

[1] Agricultural loans represent less than $0.1 million of the ending allowance at both December 31, 2014 and 2013 and $0.2 million of the ending allowance at December 31, 2012.