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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Real estate, net $ 1,387,274 $ 1,490,775
Real estate available and held for sale 237,531 286,115
Land and development, net 945,565 1,001,963
Loans receivable and other lending investments, net 1,450,439 1,601,985
Other investments 214,406 254,172
Cash and other assets 590,299 962,782
Total assets 4,825,514 5,597,792
General reserves for loan losses 85,545 108,165
Loan participations 1,370,523 1,539,696
Collectively Evaluated for Impairment    
Debt Instrument [Line Items]    
General reserves for loan losses 23,300 36,000
Loan Participations Payable    
Debt Instrument [Line Items]    
Loan participations 159,100 153,000
Encumbered Assets    
Debt Instrument [Line Items]    
Real estate, net 881,212 723,710
Real estate available and held for sale 0 103,604
Land and development, net 35,165 17,714
Loans receivable and other lending investments, net 172,581 170,162
Other investments 0 22,352
Cash and other assets 0 0
Total assets 1,088,958 1,037,542
Unencumbered Assets    
Debt Instrument [Line Items]    
Real estate, net 506,062 767,065
Real estate available and held for sale 237,531 182,511
Land and development, net 910,400 984,249
Loans receivable and other lending investments, net 1,142,050 1,314,823
Other investments 214,406 231,820
Cash and other assets 590,299 962,782
Total assets $ 3,600,748 $ 4,443,250