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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 1,435,251	$ 1,294,821
Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	909,946	794,400
Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	515,619	490,898
Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	9,686	9,523
Real Estate Finance
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 1,211,138	$ 1,056,944
Weighted Average Risk Ratings	2.51	2.77
Real Estate Finance | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 842,509	$ 713,057
Weighted Average Risk Ratings	2.52	2.72
Real Estate Finance | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 358,943	$ 334,364
Weighted Average Risk Ratings	2.47	2.85
Real Estate Finance | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Loans	$ 9,686	$ 9,523
Weighted Average Risk Ratings	3.00	3.00

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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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