Investments (Mortgage Loans and Real Estate) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount		$ 132,911		$ 150,153
Allowance for possible losses, amount		(650)		(650)
Totals, amount	[1]	$ 132,261		$ 149,503
Mortgage loans, percentage		100.00%		100.00%
Allowance for possible losses, percentage		(0.50%)		(0.40%)
Totals, percentage	[1]	99.50%		99.60%
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		$ 650	$ 650
Provision		0	0
Releases		0	$ 0
Balance, end of period		650
Less than 50% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount		$ 44,743		$ 52,564
Mortgage loans, percentage		33.70%		35.00%
50% to 60% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount		$ 44,385		$ 50,553
Mortgage loans, percentage		33.40%		33.70%
60% to 70% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount		$ 19,935		$ 14,567
Mortgage loans, percentage		15.00%		9.70%
70% to 80% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount		$ 4,291		$ 12,656
Mortgage loans, percentage		3.20%		8.40%
80% to 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount		$ 19,557		$ 5,399
Mortgage loans, percentage		14.70%		3.60%
Greater than 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount		$ 0		$ 14,414
Mortgage loans, percentage		0.00%		9.60%
Maximum [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loan to Value Ratio, threshold, percentage		90.00%
Minimum [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loan to Value Ratio, threshold, percentage		80.00%

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