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Debt Obligations, net (Collateral Assets) (Details) - USD ($) | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Real estate, net | $ 1,771,019,000 |  | $ 1,282,031,000 |  |  |
Real estate available and held for sale | 22,551,000 |  | 68,588,000 |  |  |
Land and development, net | 598,218,000 |  | 860,311,000 |  |  |
Loans receivable and other lending investments, net | 988,224,000 |  | 1,300,655,000 |  |  |
Other investments | 304,275,000 | $ 397,110,000 | 321,241,000 |  |  |
Cash and other assets | 1,329,990,000 |  | 898,252,000 |  |  |
Total assets | 5,014,277,000 | $ 4,806,947,000 | 4,731,078,000 |  |  |
Carrying amount of assets held by entities pledged as collateral | 403,500,000 |  |  |  |  |
General reserves for loan losses | 53,395,000 |  | 78,489,000 |  | $ 85,545,000 | $ 108,165,000
Loan participations | 866,098,000 |  | 1,211,079,000 |  |  |
Loan Participations Payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan participations |  |  | 102,300,000 |  |  |
Collectively Evaluated for Impairment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
General reserves for loan losses | 13,000,000 |  | 17,500,000 |  |  |
Secured Debt | 2015 $325 Million Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | 325,000,000.0 |  |  | $ 325,000,000.0 |  |
Collateral Assets |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Real estate, net | 1,620,008,000 |  | 795,321,000 |  |  |
Real estate available and held for sale | 1,055,000 |  | 20,069,000 |  |  |
Land and development, net | 12,300,000 |  | 25,100,000 |  |  |
Loans receivable and other lending investments, net | 498,524,000 |  | 194,529,000 |  |  |
Other investments | 0 |  | 0 |  |  |
Cash and other assets | 0 |  | 0 |  |  |
Total assets | 2,131,887,000 |  | 1,035,019,000 |  |  |
Non-Collateral Assets |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Real estate, net | 151,011,000 |  | 486,710,000 |  |  |
Real estate available and held for sale | 21,496,000 |  | 48,519,000 |  |  |
Land and development, net | 585,918,000 |  | 835,211,000 |  |  |
Loans receivable and other lending investments, net | 480,154,000 |  | 1,021,340,000 |  |  |
Other investments | 304,275,000 |  | 321,241,000 |  |  |
Cash and other assets | 1,329,990,000 |  | 898,252,000 |  |  |
Total assets | $ 2,872,844,000 |  | $ 3,611,273,000 |  |  |

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