Mortgage Loans on Real Estate Schedule of Financing Receivables Past Due (Details) (Commercial Real Estate Portfolio Segment [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012 days	Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Mortgage Loans on Real Estate, Past Due Period for Considering Loans as Delinquent	60
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	$ 0	$ 3,378
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	7,244	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	6,595
Financing Receivable, Recorded Investment, Past Due	7,244	9,973
Financing Receivable, Recorded Investment, Current	2,733,213	2,807,115
Mortgage Loans on Real Estate Collateral Dependent	28,281	38,923
Notes, Loans and Financing Receivable, Gross	$ 2,768,738	$ 2,856,011
Financing Receivables, Minimum Number of Days Past Due for Ceasing Accrual of Interest	90

The minimum number of days on delinquent financing receivables at which point we cease accrual of interest.

No definition available.

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- Definition

Mortgage loans on real estate at the reporting date that are not performing and will probably be satisfied by taking ownership of the real estate serving as collateral.

+ References

No definition available.

+ Details

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- Definition

Represents the past due period after which mortgage loans are considered to be delinquent for reporting purposes.

+ References

No definition available.

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- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953401-111524

+ Details

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- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

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+ Details

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- Definition

Financing receivables that are current.

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+ Details

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- Definition

Financing receivables that are equal to or greater than 90 days past due.

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+ Details

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

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+ Details

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- Definition

For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 9

-Section 03

-Paragraph 10

-Subparagraph 3

+ Details

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