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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, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Mortgage loans with an allowance, recorded investment	$ 18,311us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment		$ 16,783us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Mortgage loans with no related allowance, recorded investment	13,087us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment		2,656us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Impaired mortgage loans, recorded investment	31,398us-gaap_ImpairedFinancingReceivableRecordedInvestment		19,439us-gaap_ImpairedFinancingReceivableRecordedInvestment
Mortgage loans with an allowance, unpaid principal balance	30,763us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance		29,116us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Mortgage loans with no related allowance, unpaid principal balance	13,087us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance		2,656us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Impaired mortgage loans, unpaid principal balance	43,850us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance		31,772us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Mortgage loans with an allowance, related allowance	(12,452)us-gaap_ImpairedFinancingReceivableRelatedAllowance		(12,333)us-gaap_ImpairedFinancingReceivableRelatedAllowance
Mortgage loans with an allowance, average recorded investment	19,158us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	29,884us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Mortgage loans with no related allowance, average recorded investment	13,107us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	3,456us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Impaired mortgage loans, average recorded investment	32,265us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	33,340us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Mortgage loans with an allowance, interest income recognized	451us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	508us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Mortgage loans with no related allowance, interest income recognized	159us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	351us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Impaired mortgage loans, interest income reoognized	$ 610us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod	$ 859us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod

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