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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, 2019 USD ($) | Dec. 31, 2018 USD ($)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 674,645 | $ 866,098
Real Estate Finance |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Performing Loans | $ 668,769 | $ 857,662
Weighted Average Risk Ratings | 2.73 | 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 | $ 537,201 | $ 697,807
Weighted Average Risk Ratings | 2.71 | 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 | $ 120,658 | $ 149,663
Weighted Average Risk Ratings | 2.83 | 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 | $ 10,910 | $ 10,192
Weighted Average Risk Ratings | 3.00 | 3.00

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