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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	$ 1,377,458	$ 1,548,674
Real Estate Finance
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	$ 1,209,062	$ 1,524,347
Weighted Average Risk Ratings	3.11	3.15
Real Estate Finance | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	$ 859,250	$ 853,595
Weighted Average Risk Ratings	3.12	2.96
Real Estate Finance | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	$ 335,677	$ 641,713
Weighted Average Risk Ratings	3.09	3.37
Real Estate Finance | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	$ 14,135	$ 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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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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