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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Mortgage loans with an allowance, recorded investment	$ 26,524		$ 30,171
Mortgage loans with no related allowance, recorded investment	4,353		3,264
Impaired mortgage loans, recorded investment	30,877		33,435
Mortgage loans with an allowance, unpaid principal balance	42,986		47,018
Mortgage loans with no related allowance, unpaid principal balance	4,353		3,264
Impaired mortgage loans, unpaid principal balance	47,339		50,282
Mortgage loans with an allowance, related allowance	(16,462)		(16,847)
Mortgage loans with an allowance, average recorded investment	29,884	28,384
Mortgage loans with no related allowance, average recorded investment	3,456	20,505
Impaired mortgage loans, average recorded investment	33,340	48,889
Mortgage loans with an allowance, interest income recognized	508	331
Mortgage loans with no related allowance, interest income recognized	351	284
Impaired mortgage loans, interest income reoognized	$ 859	$ 615

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