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Debt Obligations, net - Collateral Assets (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017
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Debt Instrument [Line Items] |  |  |  |  |
Real estate, net | $ 1,621,004,000 | $ 1,771,019,000 |  |  |
Real estate available and held for sale | 253,336,000 | 22,551,000 |  |  |
Land and development, net | 616,350,000 | 598,218,000 |  |  |
Loans receivable and other lending investments, net | 894,846,000 | 988,224,000 |  |  |
Other investments | 521,999,000 | 304,275,000 |  |  |
Cash and other assets | 763,878,000 | 1,329,990,000 |  |  |
Total assets | 4,671,413,000 | 5,014,277,000 |  |  |
Carrying amount of assets held by entities pledged as collateral | 406,200,000 |  |  |  |
General reserve for loan losses | 53,298,000 | 53,395,000 | $ 69,466,000 | $ 78,489,000 |
Loan participations | 796,536,000 | 870,992,000 |  |  |
Loan Participations |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan participations | 25,100,000 | 22,500,000 |  |  |
Collectively Evaluated for Impairment |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
General reserve for loan losses | 12,410,000 | 13,000,000 |  |  |
Loan participations | 770,924,000 | 844,662,000 |  |  |
Secured Debt | 2015 $325 million Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | 325,000,000 |  |  |  | $ 325,000,000
Collateral Assets |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Real estate, net | 1,533,390,000 | 1,620,008,000 |  |  |
Real estate available and held for sale | 219,184,000 | 1,055,000 |  |  |
Land and development, net | 42,300,000 | 12,300,000 |  |  |
Loans receivable and other lending investments, net | 431,189,000 | 498,524,000 |  |  |
Other investments | 0 | 0 |  |  |
Cash and other assets | 6,601,000 | 0 |  |  |
Total assets | 2,232,664,000 | 2,131,887,000 |  |  |
Non-Collateral Assets |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Real estate, net | 87,614,000 | 151,011,000 |  |  |
Real estate available and held for sale | 34,152,000 | 21,496,000 |  |  |
Land and development, net | 574,050,000 | 585,918,000 |  |  |
Loans receivable and other lending investments, net | 450,988,000 | 480,154,000 |  |  |
Other investments | 521,999,000 | 304,275,000 |  |  |
Cash and other assets | 757,277,000 | 1,329,990,000 |  |  |
Total assets | $ 2,426,080,000 | $ 2,872,844,000 |  |  |

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