Investments (Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	$ 142,820	[1]	$ 162,031	[1]
Allowance for possible losses, amount	(650)		(4,571)
Totals, amount	142,170		157,460
Mortgage loans, percentage	100.00%	[1]	100.00%	[1]
Allowance for possible losses, percentage	(0.50%)		(2.90%)
Totals, percentage	99.50%		97.10%
Less than 50% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	58,754	[1]	68,048	[1]
Mortgage loans, percentage	41.10%	[1]	42.00%	[1]
50% to 60% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	27,832	[1]	32,091	[1]
Mortgage loans, percentage	19.50%	[1]	19.80%	[1]
60% to 70% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	23,518	[1]	25,692	[1]
Mortgage loans, percentage	16.50%	[1]	15.90%	[1]
70% to 80% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	9,431	[1]	5,505	[1]
Mortgage loans, percentage	6.60%	[1]	3.40%	[1]
80% to 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	0	[1]	0	[1]
Mortgage loans, percentage	0.00%	[1]	0.00%	[1]
Greater than 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	23,285	[1]	30,695	[1]
Mortgage loans, percentage	16.30%	[1]	18.90%	[1]
Retail [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	98,180		97,881
Mortgage loans, percentage	68.70%		60.40%
Hotal and Motel [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	4,139		25,679
Mortgage loans, percentage	2.90%		15.80%
Land and Lots [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	12,618		13,604
Mortgage loans, percentage	8.80%		8.40%
Apartment [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	16,919		11,103
Mortgage loans, percentage	11.90%		6.90%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	4,354		8,858
Mortgage loans, percentage	3.10%		5.50%
All Other [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	6,610		4,906
Mortgage loans, percentage	4.60%		3.00%
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	78,010		89,474
Mortgage loans, percentage	54.60%		55.20%
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	21,160		21,401
Mortgage loans, percentage	14.80%		13.20%
Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	2,180		15,922
Mortgage loans, percentage			9.80%
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	18,178		12,001
Mortgage loans, percentage	12.70%		7.40%
East South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	10,261		10,411
Mortgage loans, percentage	7.20%		6.40%
East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	10,367		10,018
Mortgage loans, percentage	7.30%		6.20%
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	561		609
Mortgage loans, percentage	0.40%		0.40%
Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loans, amount	$ 2,103		$ 2,195
Mortgage loans, percentage	1.50%		1.40%

[1] Loan-to-Value Ratio using the most recent appraised value.