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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) loan | Jun. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Preferred equity investment received, face value |  | $ 100,000,000.0 |  |  |
Preferred equity investment mandatory redemption period |  | 5 years |  |  |
Preferred equity investment received, recorded fair value |  | $ 77,000,000.0 |  |  |
Provision for loan losses |  |  | $ 9,052,000 | $ 6,482,000 | $ 16,937,000
Impaired Loans |  |  |  |  |
Number of non-accrual loans | loan | 1 |  | 1 | 1 |
Interest income on impaired loans |  |  | $ 0 | $ 0 | 0
Commercial Portfolio Segment |  |  |  |  |
Impaired Loans |  |  |  |  |
Impaired loans with allowance recorded, recorded investment | $ 53,305,000 |  | 53,305,000 | 37,820,000 |
Impaired loans with allowance recorded, unpaid principal balance | 52,552,000 |  | 52,552,000 | 37,923,000 |
Impaired loans with allowance recorded, related allowance | (743,000) |  | (743,000) | (21,701,000) |
Impaired loans with no related allowance recorded, average recorded investment |  |  | 0 | 0 | 0
Impaired loans with no related allowance recorded, interest income recognized |  |  | 0 | 0 | 301,000
Impaired loans with allowance recorded, average recorded investment |  |  | 50,205,000 | 38,556,000 | 106,210,000
Impaired loans with allowance recorded, interest income recognized |  |  | 2,145,000 | 0 | 0
Impaired loans, average recorded investment, total |  |  | 50,205,000 | 38,556,000 | 106,210,000
Impaired loans, interest income recognized, total |  |  | 2,145,000 | 0 | 301,000
Commercial Portfolio Segment | Subordinate mortgages |  |  |  |  |
Impaired Loans |  |  |  |  |
Impaired loans with no related allowance recorded, average recorded investment |  |  | 0 | 0 | 0
Impaired loans with no related allowance recorded, interest income recognized |  |  | 0 | 0 | 301,000
Impaired loans, average recorded investment, total |  |  | 0 | 0 | 0
Impaired loans, interest income recognized, total |  |  | 0 | 0 | 301,000
Commercial Portfolio Segment | Senior mortgages |  |  |  |  |
Impaired Loans |  |  |  |  |
Impaired loans with allowance recorded, recorded investment | 53,305,000 |  | 53,305,000 | 37,820,000 |
Impaired loans with allowance recorded, unpaid principal balance | 52,552,000 |  | 52,552,000 | 37,923,000 |
Impaired loans with allowance recorded, related allowance | (743,000) |  | (743,000) | (21,701,000) |
Impaired loans with allowance recorded, average recorded investment |  |  | 50,205,000 | 38,556,000 | 67,041,000
Impaired loans with allowance recorded, interest income recognized |  |  | 2,145,000 | 0 | 0
Impaired loans, average recorded investment, total |  |  | 50,205,000 | 38,556,000 | 67,041,000
Impaired loans, interest income recognized, total |  |  | 2,145,000 | 0 | 0
Commercial Portfolio Segment | Corporate/Partnership loans |  |  |  |  |
Impaired Loans |  |  |  |  |
Impaired loans with allowance recorded, average recorded investment |  |  | 0 | 0 | 39,169,000
Impaired loans with allowance recorded, interest income recognized |  |  | 0 | 0 | 0
Impaired loans, average recorded investment, total |  |  | 0 | 0 | 39,169,000
Impaired loans, interest income recognized, total |  |  | 0 | $ 0 | $ 0
Nonperforming Financial Instruments | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Gross carrying value of loan | 15,200,000 |  | $ 15,200,000 |  |
Proceeds from collection of loan receivable | 11,000,000.0 |  |  |  |
Provision for loan losses | $ 4,200,000 |  |  |  |
Nonperforming Financial Instruments | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Gross carrying value of loan |  | 145,800,000 |  |  |
Proceeds from collection of loan receivable |  | 45,800,000 |  |  |
Provision for loan losses |  | $ 21,400,000 |  |  |

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