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Mortgage Loans on Real Estate (Impaired Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Mortgage loans with an allowance, recorded investment	$ 16,783us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	$ 30,171us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Mortgage loans with no related allowance, recorded investment	2,656us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	3,264us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Impaired mortgage loans, recorded investment	19,439us-gaap_ImpairedFinancingReceivableRecordedInvestment	33,435us-gaap_ImpairedFinancingReceivableRecordedInvestment
Mortgage loans with an allowance, unpaid principal balance	29,116us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	47,018us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Mortgage loans with no related allowance, unpaid principal balance	2,656us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	3,264us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Impaired mortgage loans, unpaid principal balance	31,772us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance	50,282us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Mortgage loans with an allowance, related allowance	(12,333)us-gaap_ImpairedFinancingReceivableRelatedAllowance	(16,847)us-gaap_ImpairedFinancingReceivableRelatedAllowance
Mortgage loans with an allowance, average recorded investment	18,465us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	33,772us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	37,480us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Mortgage loans with no related allowance, average recorded investment	2,656us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	3,264us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	27,696us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Impaired mortgage loans, average recorded investment	21,121us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	37,036us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	65,176us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Mortgage loans with an allowance, interest income recognized	1,797us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	2,094us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	1,946us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Mortgage loans with no related allowance, interest income recognized	43us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	138us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	1,664us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Impaired mortgage loans, interest income recognized	$ 1,840us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod	$ 2,232us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod	$ 3,610us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod

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