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Mortgage Loans on Real Estate (Allowance for Loan Losses Rollforward) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance     $ (22,633)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Ending allowance balance (19,452)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate   (22,633)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Specific Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (12,333)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
(16,847)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
 
Charge-offs 128us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
949us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
 
Recoveries 1,255us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
 
Change in provision for credit losses (1,502)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
(564)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
 
Ending allowance balance (12,452)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
(16,462)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForNotesReceivableMember
 
General Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (10,300)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
(9,200)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
 
Charge-offs 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
 
Recoveries 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
 
Change in provision for credit losses 3,300us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
400us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
 
Ending allowance balance $ (7,000)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
$ (8,800)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember