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Debt Obligations, net - Collateral Assets (Details) - USD ($)	Jun. 30, 2019	May 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Real estate, net	$ 1,421,602,000			$ 1,771,019,000
Real estate available and held for sale	12,770,000			22,551,000
Net investment in leases	421,842,000	$ 424,100,000		0
Land and development, net	668,656,000			598,218,000
Loans receivable and other lending investments, net	902,146,000			988,224,000
Other investments	564,170,000			304,275,000
Cash and other assets	774,841,000			1,329,990,000
Total assets	4,766,027,000			5,014,277,000
Carrying amount of assets held by entities pledged as collateral	403,200,000
General reserve for loan losses	53,408,000		$ 53,298,000	53,395,000	$ 54,495,000	$ 69,466,000	$ 78,489,000
Loan participations	757,570,000			870,992,000
Loan Participations
Debt Instrument [Line Items]
Loan participations	30,100,000			22,500,000
Collectively Evaluated for Impairment
Debt Instrument [Line Items]
General reserve for loan losses	12,520,000			13,000,000
Loan participations	732,424,000			844,662,000
Secured Debt | 2015 $325 million Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	325,000,000.0							$ 325,000,000.0
Collateral Assets
Debt Instrument [Line Items]
Real estate, net	1,254,161,000			1,620,008,000
Real estate available and held for sale	0			1,055,000
Net investment in leases	421,842,000			0
Land and development, net	42,300,000			12,300,000
Loans receivable and other lending investments, net	364,665,000			498,524,000
Other investments	0			0
Cash and other assets	11,010,000			0
Total assets	2,093,978,000			2,131,887,000
Non-Collateral Assets
Debt Instrument [Line Items]
Real estate, net	167,441,000			151,011,000
Real estate available and held for sale	12,770,000			21,496,000
Net investment in leases	0			0
Land and development, net	626,356,000			585,918,000
Loans receivable and other lending investments, net	519,939,000			480,154,000
Other investments	564,170,000			304,275,000
Cash and other assets	763,831,000			1,329,990,000
Total assets	$ 2,654,507,000			$ 2,872,844,000

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