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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 870,992 | $ 1,216,332
Real Estate Finance |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 857,662 | $ 1,056,944
Weighted Average Risk Ratings | 2.77 | 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 | $ 697,807 | $ 713,057
Weighted Average Risk Ratings | 2.76 | 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 | $ 149,663 | $ 334,364
Weighted Average Risk Ratings | 2.84 | 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 | $ 10,192 | $ 9,523
Weighted Average Risk Ratings | 3.00 | 3.00

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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