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Debt Obligations, net (Collateral Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Real estate, net	$ 1,282,031	$ 1,387,274
Real estate available and held for sale	68,588	237,531
Land and development, net	860,311	945,565
Loans receivable and other lending investments, net	1,300,655	1,450,439
Other investments	321,241	214,406
Cash and other assets	898,252	590,299
Total assets	4,731,078	4,825,514
General reserves for loan losses	78,489	85,545
Loan participations	1,211,079	1,370,523
Collectively Evaluated for Impairment
Debt Instrument [Line Items]
General reserves for loan losses	17,500	23,300
Loan Participations Payable
Debt Instrument [Line Items]
Loan participations	102,300	159,100
Collateral Assets
Debt Instrument [Line Items]
Real estate, net	795,321	881,212
Real estate available and held for sale	20,069	0
Land and development, net	25,100	35,165
Loans receivable and other lending investments, net	194,529	172,581
Other investments	0	0
Cash and other assets	0	0
Total assets	1,035,019	1,088,958
Non-Collateral Assets
Debt Instrument [Line Items]
Real estate, net	486,710	506,062
Real estate available and held for sale	48,519	237,531
Land and development, net	835,211	910,400
Loans receivable and other lending investments, net	1,021,340	1,142,050
Other investments	321,241	214,406
Cash and other assets	898,252	590,299
Total assets	$ 3,611,273	$ 3,600,748

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Real Estate Investment Property, Held for Use, Net

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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