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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Real estate, net	$ 1,302,143	$ 1,282,031
Real estate available and held for sale	41,857	68,588
Land and development, net	681,410	860,311
Loans receivable and other lending investments, net	1,400,474	1,300,655
Other investments	422,853	321,241
Cash and other assets	601,322	898,252
Total assets	4,450,059	4,731,078
Loans receivable, net	1,359,761	1,211,079
Total loan participations payable, net
Debt Instrument [Line Items]
Loans receivable, net	85,300	102,300
Collectively Evaluated for Impairment
Debt Instrument [Line Items]
General reserves for loan losses	16,600	17,500
Collateral Assets
Debt Instrument [Line Items]
Real estate, net	790,545	795,321
Real estate available and held for sale	0	20,069
Land and development, net	25,100	25,100
Loans receivable and other lending investments, net	185,161	194,529
Other investments	0	0
Cash and other assets	0	0
Total assets	1,000,806	1,035,019
Non-Collateral Assets
Debt Instrument [Line Items]
Real estate, net	511,598	486,710
Real estate available and held for sale	41,857	48,519
Land and development, net	656,310	835,211
Loans receivable and other lending investments, net	1,146,571	1,021,340
Other investments	422,853	321,241
Cash and other assets	601,322	898,252
Total assets	$ 3,380,511	$ 3,611,273

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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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-SubTopic 210
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Carrying amount as of the balance sheet date, net of valuation allowances and impairment losses, of costs of land expected to be developed in the near term plus capitalized costs of development, for purposes of selling completed units to home buyers or commercial or industrial entities..

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