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Debt Obligations, net - Collateral Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	May 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Real estate, net	$ 1,530,116			$ 1,771,019
Real estate available and held for sale	12,688			22,551
Net investment in leases	421,252		$ 424,100
Land and development, net	610,380			598,218
Loans receivable and other lending investments, net	808,289			988,224
Other investments	733,793			304,275
Cash and other assets	1,463,440			1,329,990
Total assets	5,579,958			5,014,277
Carrying amount of assets held by entities pledged as collateral	412,000
General reserve for loan losses	30,401	$ 53,408		53,395	$ 54,695	$ 54,495	$ 78,489
Loan participations	660,522			870,992
Loan Participations
Debt Instrument [Line Items]
Loan participations	33,100			22,500
Collectively Evaluated for Impairment
Debt Instrument [Line Items]
General reserve for loan losses	8,700			13,000
Loan participations	643,823			844,662
Collateral Assets
Debt Instrument [Line Items]
Real estate, net	1,413,531			1,620,008
Real estate available and held for sale	0			1,055
Net investment in leases	421,252			0
Land and development, net	42,402			12,300
Loans receivable and other lending investments, net	308,474			498,524
Other investments	0			0
Cash and other assets	2,645			0
Total assets	2,188,304			2,131,887
Non-Collateral Assets
Debt Instrument [Line Items]
Real estate, net	116,585			151,011
Real estate available and held for sale	12,688			21,496
Net investment in leases	0			0
Land and development, net	567,978			585,918
Loans receivable and other lending investments, net	475,374			480,154
Other investments	733,793			304,275
Cash and other assets	1,460,795			1,329,990
Total assets	$ 3,367,213			$ 2,872,844

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