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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2015
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Debt Instrument [Line Items] |  |  |  |
Real estate, net | $ 1,914,999,000 | $ 1,282,031,000 |  |
Real estate available and held for sale | 37,597,000 | 68,588,000 |  |
Land and development, net | 641,627,000 | 860,311,000 |  |
Loans receivable and other lending investments, net | 1,052,872,000 | 1,300,655,000 |  |
Other investments | 293,017,000 | 321,241,000 |  |
Cash and other assets | 1,418,055,000 | 898,252,000 |  |
Total assets | 5,358,167,000 | 4,731,078,000 |  |
Carrying amount of assets held by entities pledged as collateral | 423,600,000 |  |  |
Loans receivable, net | 934,507,000 | 1,211,079,000 |  |
Loan participations payable, net |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loans receivable, net | 14,700,000 | 102,300,000 |  |
Collectively Evaluated for Impairment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
General reserves for loan losses | 14,100,000 | 17,500,000 |  |
Collateral Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Real estate, net | 1,583,330,000 | 795,321,000 |  |
Real estate available and held for sale | 0 | 20,069,000 |  |
Land and development, net | 10,100,000 | 25,100,000 |  |
Loans receivable and other lending investments, net | 523,425,000 | 194,529,000 |  |
Other investments | 0 | 0 |  |
Cash and other assets | 0 | 0 |  |
Total assets | 2,116,855,000 | 1,035,019,000 |  |
Non-Collateral Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Real estate, net | 331,669,000 | 486,710,000 |  |
Real estate available and held for sale | 37,597,000 | 48,519,000 |  |
Land and development, net | 631,527,000 | 835,211,000 |  |
Loans receivable and other lending investments, net | 528,812,000 | 1,021,340,000 |  |
Other investments | 293,017,000 | 321,241,000 |  |
Cash and other assets | 1,418,055,000 | 898,252,000 |  |
Total assets | 3,240,677,000 | $ 3,611,273,000 |  |
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

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