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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2015
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Real estate, net | $ 1,893,789,000 | $ 1,282,031,000 |  |
Real estate available and held for sale | 61,549,000 | 68,588,000 |  |
Land and development, net | 650,531,000 | 860,311,000 |  |
Loans receivable and other lending investments, net | 1,029,052,000 | 1,300,655,000 |  |
Other investments | 302,318,000 | 321,241,000 |  |
Cash and other assets | 1,142,750,000 | 898,252,000 |  |
Total assets | 5,079,989,000 | 4,731,078,000 |  |
Carrying amount of assets held by entities pledged as collateral | 410,400,000 |  |  |
Loans receivable, net | 909,280,000 | 1,211,079,000 |  |
Loan participations payable, net |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loans receivable, net | 18,400,000 | 102,300,000 |  |
Collectively Evaluated for Impairment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
General reserves for loan losses | 14,300,000 | 17,500,000 |  |
2015 $325 million Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 325,000,000 |  | $ 325,000,000 | $ 250,000,000.0
Collateral Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Real estate, net | 1,570,920,000 | 795,321,000 |  |
Real estate available and held for sale | 31,145,000 | 20,069,000 |  |
Land and development, net | 17,500,000 | 25,100,000 |  |
Loans receivable and other lending investments, net | 499,895,000 | 194,529,000 |  |
Other investments | 0 | 0 |  |
Cash and other assets | 6,398,000 | 0 |  |
Total assets | 2,125,858,000 | 1,035,019,000 |  |
Non-Collateral Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Real estate, net | 322,869,000 | 486,710,000 |  |
Real estate available and held for sale | 30,404,000 | 48,519,000 |  |
Land and development, net | 633,031,000 | 835,211,000 |  |
Loans receivable and other lending investments, net | 525,103,000 | 1,021,340,000 |  |
Other investments | 302,318,000 | 321,241,000 |  |
Cash and other assets | 1,136,352,000 | 898,252,000 |  |
Total assets | $ 2,950,077,000 | $ 3,611,273,000 |  |

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