Non-Recourse and Limited Recourse Debt (Narratives) (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Additional Debt Disclosures
Non recourse debt	$ 93,600,000
Debt, weighted average interest rate	4.60%
Debt instrument terms (years)	10 years 1 month 6 days
Debt instrument, maturity date, range start	Oct. 01, 2013
Debt instrument, maturity date, range end	Feb. 01, 2038
Impact due to change in foreign currency exchange rates	17,500,000
Mortgage notes payable, collateral	2,500,000,000	2,400,000,000
2013 Investments
Additional Debt Disclosures
Non recourse debt	17,100,000
2012 Investments
Additional Debt Disclosures
Non recourse debt	$ 76,500,000
Fixed Interest Rate
Additional Debt Disclosures
Mortgage loan real estate, minimum interest rate	2.00%
Mortgage loan real estate, maximum interest rate	8.00%
Variable Interest Rate
Additional Debt Disclosures
Mortgage loan real estate, minimum interest rate	2.80%
Mortgage loan real estate, maximum interest rate	8.50%

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The aggregate carrying value of real estate assets posted as collateral for the mortgage loans.

+ References

No definition available.

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- Definition

Debt Instrument Term in years

+ References

No definition available.

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- Definition

Change in the carrying value of debt due to foreign currency exchange rates.

+ References

No definition available.

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- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

+ References

No definition available.

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- Definition

The highest stated interest rate within the mortgage loans included in the loan grouping.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.3)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

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The lowest stated interest rate within the mortgage loans included in the loan grouping.

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Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

+ References

No definition available.

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