Investments (Mortgage Loans and Real Estate) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	$ 152,858			$ 152,858			$ 133,415
Allowance for possible losses, amount	(650)			(650)			(650)
Totals, amount	152,208	[1]		152,208	[1]		132,765	[1]
Mortgage loans, percentage	100.00%			100.00%			100.00%
Allowance for possible losses, percentage	(0.40%)			(0.40%)			(0.50%)
Totals, percentage	99.60%	[1]		99.60%	[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			650
Net gain on sale of real estate investment	45		0	134		0
Less than 50% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	51,827			51,827			57,445
Mortgage loans, percentage	33.90%			33.90%			43.00%
50% to 60% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	28,194			28,194			23,339
Mortgage loans, percentage	18.40%			18.40%			17.50%
60% to 70% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	44,263			44,263			20,120
Mortgage loans, percentage	29.00%			29.00%			15.10%
70% to 80% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	8,515			8,515			9,723
Mortgage loans, percentage	5.60%			5.60%			7.30%
80% to 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	0			0			0
Mortgage loans, percentage	0.00%			0.00%			0.00%
Greater than 90% [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan, amount	$ 20,059			$ 20,059			$ 22,788
Mortgage loans, percentage	13.10%			13.10%			17.10%

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