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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Real estate, net	$ 1,342,982	$ 1,387,274
Real estate available and held for sale	68,045	237,531
Land and development, net	855,497	945,565
Loans receivable and other lending investments, net	1,170,565	1,450,439
Other investments	276,821	214,406
Cash and other assets	1,200,845	590,299
Total assets	4,914,755	4,825,514
Loans receivable, net	1,084,976	1,370,523
Total loan participations payable, net
Debt Instrument [Line Items]
Loans receivable, net	107,100	159,100
Collectively Evaluated for Impairment
Debt Instrument [Line Items]
General reserves for loan losses	17,800	23,300
Encumbered Assets
Debt Instrument [Line Items]
Real estate, net	871,613	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	137,722	172,581
Other investments	0	0
Cash and other assets	0	0
Total assets	1,034,435	1,088,958
Unencumbered Assets
Debt Instrument [Line Items]
Real estate, net	471,369	506,062
Real estate available and held for sale	68,045	237,531
Land and development, net	830,397	910,400
Loans receivable and other lending investments, net	943,592	1,142,050
Other investments	276,821	214,406
Cash and other assets	1,200,845	590,299
Total assets	$ 3,791,069	$ 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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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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