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Mortgage Loans on Real Estate (Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Mortgage loans with an allowance, recorded investment	$ 30,171	$ 29,976	$ 44,034
Mortgage loans with no related allowance, recorded investment	3,264	27,765	63,023
Impaired mortgage loans, recorded investment	33,435	57,741	107,057
Mortgage loans with an allowance, unpaid principal balance	47,018	53,110	67,698
Mortgage loans with no related allowance, unpaid principal balance	3,264	27,765	63,023
Impaired mortgage loans, unpaid principal balance	50,282	80,875	130,721
Mortgage loans with an allowance, related allowance	(16,847)	(23,134)	(23,664)
Mortgage loans with an allowance, average recorded investment	33,772	37,480	53,617
Mortgage loans with no related allowance, average recorded investment	3,264	27,696	60,974
Impaired mortgage loans, average recorded investment	37,036	65,176	114,591
Mortgage loans with an allowance, interest income recognized	2,094	1,946	3,284
Mortgage loans with no related allowance, interest income recognized	138	1,664	3,509
Impaired mortgage loans, interest income recognized	$ 2,232	$ 3,610	$ 6,793

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