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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 1,632,431	$ 1,295,703
Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	927,215
Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	676,225
Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	28,991
Real Estate Finance
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 1,454,295	$ 1,166,465
Weighted Average Risk Ratings	3.15	3.23
Real Estate Finance | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 798,972	$ 611,009
Weighted Average Risk Ratings	2.94	2.73
Real Estate Finance | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 626,332	$ 501,620
Weighted Average Risk Ratings	3.40	3.88
Real Estate Finance | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 28,991	$ 53,836
Weighted Average Risk Ratings	3.64	2.87
Minimum
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Risk rating	1
Maximum
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Risk rating	5

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Includes any additional disclosures related to the credit quality of financing receivables. This may include a description of a credit quality indicator or a description of how the internal risk ratings used by a company relate to the likelihood of loss.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 29



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953659-111524



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 30



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953664-111524

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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. 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. Excludes 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

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