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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, 2019 USD ($) | Dec. 31, 2018 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 849,834 | $ 924,387
Senior mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 694,908 | 764,532
Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 144,556 | 149,663
Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | 10,370 | 10,192
Real Estate Finance |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 783,334 | $ 857,662
Weighted Average Risk Ratings | 2.83 | 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 | $ 628,408 | $ 697,807
Weighted Average Risk Ratings | 2.81 | 2.76
Real Estate Finance | Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 144,556 | $ 149,663
Weighted Average Risk Ratings | 2.89 | 2.84
Real Estate Finance | Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 10,370 | $ 10,192
Weighted Average Risk Ratings | 3.00 | 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://fasb.org/us-gaap/role/ref/legacyRef -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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