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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Mortgage loans with an allowance, recorded investment	$ 29,937	$ 29,976
Mortgage loans with no related allowance, recorded investment	18,782	27,765
Impaired mortgage loans, recorded investment	48,719	57,741
Mortgage loans with an allowance, unpaid principal balance	50,055	53,110
Mortgage loans with no related allowance, unpaid principal balance	18,782	27,765
Impaired mortgage loans, unpaid principal balance	68,837	80,875
Mortgage loans with an allowance, related allowance	(20,118)	(23,134)
Mortgage loans with an allowance, average recorded investment	32,897	37,480
Mortgage loans with no related allowance, average recorded investment	18,976	27,696
Impaired mortgage loans, average recorded investment	51,873	65,176
Mortgage loans with an allowance, interest income recognized	2,082	1,946
Mortgage loans with no related allowance, interest income recognized	799	1,664
Impaired mortgage loans, interest income reoognized	$ 2,881	$ 3,610

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