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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, 2018 USD ($) | Dec. 31, 2017 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 968,872 | $ 1,294,821
Senior mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 805,506 | 794,400
Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 153,346 | 490,898
Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 10,020 | 9,523
Real Estate Finance |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 901,936 | $ 1,056,944
Weighted Average Risk Ratings | 3.22 | 2.77
Real Estate Finance | Senior mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 738,570 | $ 713,057
Weighted Average Risk Ratings | 3.18 | 2.72
Real Estate Finance | Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 153,346 | $ 334,364
Weighted Average Risk Ratings | 3.39 | 2.85
Real Estate Finance | Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 10,020 | $ 9,523
Weighted Average Risk Ratings | 3.50 | 3.00

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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 + Details
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