Investments (Mortgage Loans and Real Estate) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	$ 129,156			$ 133,415
Allowance for possible losses, amount	(650)			(650)
Totals, amount	128,506	[1]		132,765	[1]
Mortgage loans, percentage	100.00%			100.00%
Allowance for possible losses, percentage	(0.50%)			(0.50%)
Totals, percentage	99.50%	[1]		99.50%	[1]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	650		650	650
Provision	0			0
Releases	0			0
Balance, end of period	650			650
Net gain on sale of real estate investment	89		0
Less than 50% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	52,366			57,445
Mortgage loans, percentage	40.50%			43.00%
50% to 60% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	27,073			23,339
Mortgage loans, percentage	21.00%			17.50%
60% to 70% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	17,384			20,120
Mortgage loans, percentage	13.50%			15.10%
70% to 80% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	9,678			9,723
Mortgage loans, percentage	7.50%			7.30%
80% to 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	0			0
Mortgage loans, percentage	0.00%			0.00%
Greater than 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	$ 22,655			$ 22,788
Mortgage loans, percentage	17.50%			17.10%

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