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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Real estate, net | $ 1,323,862 | $ 1,387,274
Real estate available and held for sale | 65,658 | 237,531
Land and development, net | 861,507 | 945,565
Loans receivable and other lending investments, net | 1,109,442 | 1,450,439
Other investments | 289,037 | 214,406
Cash and other assets | 2,145,713 | 590,299
Total assets | 5,795,219 | 4,825,514
Loans receivable, net | 1,022,293 | 1,370,523
Total loan participations payable, net |  |
Debt Instrument [Line Items] |  |
Loans receivable, net | 122,200 | 159,100
Collectively Evaluated for Impairment |  |
Debt Instrument [Line Items] |  |
General reserves for loan losses | 15,200 | 23,300
Encumbered Assets |  |
Debt Instrument [Line Items] |  |
Real estate, net | 841,570 | 881,212
Real estate available and held for sale | 0 | 0
Land and development, net | 25,100 | 35,165
Loans receivable and other lending investments, net | 188,973 | 172,581
Other investments | 0 | 0
Cash and other assets | 0 | 0
Total assets | 1,055,643 | 1,088,958
Unencumbered Assets |  |
Debt Instrument [Line Items] |  |
Real estate, net | 482,292 | 506,062
Real estate available and held for sale | 65,658 | 237,531
Land and development, net | 836,407 | 910,400
Loans receivable and other lending investments, net | 813,447 | 1,142,050
Other investments | 289,037 | 214,406
Cash and other assets | 2,145,713 | 590,299
Total assets | $ 4,632,554 | $ 3,600,748

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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. In addition, amount also includes total debt and equity financial instruments including: securities held-to-maturity and securities available-for-sale. + References No definition available. + Details
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