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Mortgage Loans on Real Estate (Rollforward of Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending allowance balance	$ (22,633)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate	$ (26,047)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Specific Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning allowance balance	(16,847)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	(23,134)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	(23,664)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember
Charge-offs	9,211us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	9,738us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	15,562us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember
Recoveries	255us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	4,070us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember
Change in provision for credit losses	(4,952)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	(7,521)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	(15,032)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember
Ending allowance balance	(12,333)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	(16,847)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember	(23,134)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember
General Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning allowance balance	(9,200)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	(11,100)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	(9,300)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	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	0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember
Change in provision for credit losses	(1,100)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	1,900us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	(1,800)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember
Ending allowance balance	$ (10,300)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	$ (9,200)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	$ (11,100)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember

X

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 310

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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Period Type:	duration

X

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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Period Type:	duration

X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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