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Debt Obligations, net - Collateral Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | May 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Real estate, net | $ 1,530,116 |  |  | $ 1,771,019 |  |  |
Real estate available and held for sale | 12,688 |  |  | 22,551 |  |  |
Net investment in leases | 421,252 |  | $ 424,100 |  |  |  |
Land and development, net | 610,380 |  |  | 598,218 |  |  |
Loans receivable and other lending investments, net | 808,289 |  |  | 988,224 |  |  |
Other investments | 733,793 |  |  | 304,275 |  |  |
Cash and other assets | 1,463,440 |  |  | 1,329,990 |  |  |
Total assets | 5,579,958 |  |  | 5,014,277 |  |  |
Carrying amount of assets held by entities pledged as collateral | 412,000 |  |  |  |  |  |
General reserve for loan losses | 30,401 | $ 53,408 |  | 53,395 | $ 54,695 | $ 54,495 | $ 78,489
Loan participations | 660,522 |  |  | 870,992 |  |  |
Loan Participations |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loan participations | 33,100 |  |  | 22,500 |  |  |
Collectively Evaluated for Impairment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
General reserve for loan losses | 8,700 |  |  | 13,000 |  |  |
Loan participations | 643,823 |  |  | 844,662 |  |  |
Collateral Assets |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Real estate, net | 1,413,531 |  |  | 1,620,008 |  |  |
Real estate available and held for sale | 0 |  |  | 1,055 |  |  |
Net investment in leases | 421,252 |  |  | 0 |  |  |
Land and development, net | 42,402 |  |  | 12,300 |  |  |
Loans receivable and other lending investments, net | 308,474 |  |  | 498,524 |  |  |
Other investments | 0 |  |  | 0 |  |  |
Cash and other assets | 2,645 |  |  | 0 |  |  |
Total assets | 2,188,304 |  |  | 2,131,887 |  |  |
Non-Collateral Assets |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Real estate, net | 116,585 |  |  | 151,011 |  |  |
Real estate available and held for sale | 12,688 |  |  | 21,496 |  |  |
Net investment in leases | 0 |  |  | 0 |  |  |
Land and development, net | 567,978 |  |  | 585,918 |  |  |
Loans receivable and other lending investments, net | 475,374 |  |  | 480,154 |  |  |
Other investments | 733,793 |  |  | 304,275 |  |  |
Cash and other assets | 1,460,795 |  |  | 1,329,990 |  |  |
Total assets | $ 3,367,213 |  |  | $ 2,872,844 |  |  |

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