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Debt Obligations, net (Encumbered/Unencumbered Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Real estate, net	$ 1,323,862	$ 1,387,274
Real estate available and held for sale	65,658	237,531
Land and development, net	861,507	945,565
Loans receivable and other lending investments, net	1,109,442	1,450,439
Other investments	289,037	214,406
Cash and other assets	2,145,713	590,299
Total assets	5,795,219	4,825,514
Loans receivable, net	1,022,293	1,370,523
Total loan participations payable, net
Debt Instrument [Line Items]
Loans receivable, net	122,200	159,100
Collectively Evaluated for Impairment
Debt Instrument [Line Items]
General reserves for loan losses	15,200	23,300
Encumbered Assets
Debt Instrument [Line Items]
Real estate, net	841,570	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	188,973	172,581
Other investments	0	0
Cash and other assets	0	0
Total assets	1,055,643	1,088,958
Unencumbered Assets
Debt Instrument [Line Items]
Real estate, net	482,292	506,062
Real estate available and held for sale	65,658	237,531
Land and development, net	836,407	910,400
Loans receivable and other lending investments, net	813,447	1,142,050
Other investments	289,037	214,406
Cash and other assets	2,145,713	590,299
Total assets	$ 4,632,554	$ 3,600,748

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity.

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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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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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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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