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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Real estate, net | $ 1,435,920 | $ 1,593,983
Real estate available and held for sale | 126,070 | 137,274
Land and development, net | 1,046,013 | 1,001,963
Loans receivable and other lending investments, net | 1,568,439 | 1,601,985
Other investments | 228,756 | 254,172
Cash and other assets | 804,199 | 1,008,415
Total assets | 5,209,397 | 5,597,792
Loans receivable, net | 1,508,503 | 1,539,696
Loan Participations Payable |  |
Debt Instrument [Line Items] |  |
Loans receivable, net | 186,600 | 153,000
Encumbered Assets |  |
Debt Instrument [Line Items] |  |
Real estate, net | 903,185 | 816,721
Real estate available and held for sale | 0 | 10,593
Land and development, net | 22,364 | 17,714
Loans receivable and other lending investments, net | 169,117 | 170,162
Other investments | 0 | 22,352
Cash and other assets | 0 | 0
Total assets | 1,094,666 | 1,037,542
Unencumbered Assets |  |
Debt Instrument [Line Items] |  |
Real estate, net | 532,735 | 777,262
Real estate available and held for sale | 126,070 | 126,681
Land and development, net | 1,023,649 | 984,249
Loans receivable and other lending investments, net | 1,249,698 | 1,314,823
Other investments | 228,756 | 231,820
Cash and other assets | 804,199 | 1,008,415
Total assets | 3,965,107 | 4,443,250
Collectively Evaluated for Impairment |  |
Debt Instrument [Line Items] |  |
General reserves for loan losses | $ 37,000 | $ 36,000

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