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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Impaired Loans |  |  |  |
Impaired loans with allowance recorded, Recorded Investment |  | $ 37,820,000 | $ 66,725,000 |
Impaired loans with allowance recorded, Unpaid Principal Balance |  | 37,923,000 | 66,777,000 |
Impaired loans, Related Allowance |  | (21,701,000) | (40,395,000) |
Impaired loans with no related allowance recorded, Average Recorded Investment |  | 0 | 0 | $ 6,582,000
Impaired loans with no related allowance recorded, Interest Income Recognized |  | 0 | 301,000 | 1,127,000
Impaired loans with allowance recorded, Average Recorded Investment |  | 38,556,000 | 106,210,000 | 239,505,000
Impaired loans with allowance recorded, Interest Income Recognized |  | 0 | 0 | 0
Impaired loans, Average Recorded Investment |  | 38,556,000 | 106,210,000 | 246,087,000
Impaired loans, Interest Income Recognized |  | 0 | 301,000 | 1,127,000
Gross carrying value of loan |  | 703,279,000 | 919,493,000 |
Preferred equity investment received, face value | $ 100,000,000.0 |  |  |
Preferred equity investment mandatory redemption period (in years) | 5 years |  |  |
Preferred equity investment received, recorded fair value | $ 77,000,000.0 |  |  |
Provision for (recovery of) loan losses |  | 6,482,000 | 16,937,000 | (5,828,000)
Nonperforming Financial Instruments |  |  |  |
Impaired Loans |  |  |  |
Impaired loans, Interest Income Recognized |  | 0 | 0 | 0
Senior mortgages |  |  |  |
Impaired Loans |  |  |  |
Impaired loans with allowance recorded, Recorded Investment |  | 37,820,000 | 66,725,000 |
Impaired loans with allowance recorded, Unpaid Principal Balance |  | 37,923,000 | 66,777,000 |
Impaired loans, Related Allowance |  | (21,701,000) | (40,395,000) |
Impaired loans with allowance recorded, Average Recorded Investment |  | 38,556,000 | 67,041,000 | 82,749,000
Impaired loans with allowance recorded, Interest Income Recognized |  | 0 | 0 | 0
Impaired loans, Average Recorded Investment |  | 38,556,000 | 67,041,000 | 82,749,000
Impaired loans, Interest Income Recognized |  | 0 | 0 | 0
Gross carrying value of loan |  | 572,584,000 | 760,749,000 |
Subordinate mortgages |  |  |  |
Impaired Loans |  |  |  |
Impaired loans with no related allowance recorded, Average Recorded Investment |  | 0 | 0 | 6,582,000
Impaired loans with no related allowance recorded, Interest Income Recognized |  | 0 | 301,000 | 1,127,000
Impaired loans, Average Recorded Investment |  | 0 | 0 | 6,582,000
Impaired loans, Interest Income Recognized |  | 0 | 301,000 | 1,127,000
Gross carrying value of loan |  | 10,877,000 | 10,161,000 |
Corporate/Partnership loans |  |  |  |
Impaired Loans |  |  |  |
Impaired loans with allowance recorded, Average Recorded Investment |  | 0 | 39,169,000 | 156,756,000
Impaired loans with allowance recorded, Interest Income Recognized |  | 0 | 0 | 0
Impaired loans, Average Recorded Investment |  | 0 | 39,169,000 | 156,756,000
Impaired loans, Interest Income Recognized |  | 0 | 0 | $ 0
Gross carrying value of loan |  | $ 119,818,000 | $ 148,583,000 |
Corporate/Partnership loans | Nonperforming Financial Instruments |  |  |  |
Impaired Loans |  |  |  |
Gross carrying value of loan | 145,800,000 |  |  |
Proceeds from collection of loan receivable | 45,800,000 |  |  |
Provision for (recovery of) loan losses | $ 21,400,000 |  |  |

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