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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, 2016 USD ($)	Dec. 31, 2015 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 1,672,890	$ 1,656,839
Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	1,085,646	980,349
Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	561,664	647,451
Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	25,580	29,039
Real Estate Finance
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 1,376,190	$ 1,524,347
Weighted Average Risk Ratings	2.63	3.15
Real Estate Finance | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 957,681	$ 853,595
Weighted Average Risk Ratings	2.78	2.96
Real Estate Finance | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 404,493	$ 641,713
Weighted Average Risk Ratings	2.25	3.37
Real Estate Finance | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 14,016	$ 29,039
Weighted Average Risk Ratings	3.00	3.64

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Represents the weighted average risk rating of the instrument.

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- Definition

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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