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Debt Obligations, net (Collateral Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	May 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Real estate, net	$ 1,527,219		$ 1,771,019
Real estate available and held for sale	8,650		22,551
Net investment in leases	418,915	$ 424,100	0
Land and development, net	580,545		598,218
Loans receivable and other lending investments, net	827,861		988,224
Other investments	907,875		304,275
Cash and other assets	814,044		1,329,990
Total assets	5,085,109		5,014,277
Carrying amount of assets held by entities pledged as collateral	438,700
General reserves for loan losses	28,634		53,395	$ 78,489	$ 85,545
Performing Loans	674,645		866,098
Loan Participations Payable
Debt Instrument [Line Items]
Performing Loans			22,500
Collectively Evaluated for Impairment
Debt Instrument [Line Items]
General reserves for loan losses	6,933		13,000
Collateral Assets
Debt Instrument [Line Items]
Real estate, net	1,409,585		1,620,008
Real estate available and held for sale	0		1,055
Net investment in leases	418,915
Land and development, net	0		12,300
Loans receivable and other lending investments, net	233,104		498,524
Other investments	0		0
Cash and other assets	0		0
Total assets	2,061,604		2,131,887
Non-Collateral Assets
Debt Instrument [Line Items]
Real estate, net	117,634		151,011
Real estate available and held for sale	8,650		21,496
Net investment in leases	0
Land and development, net	580,545		585,918
Loans receivable and other lending investments, net	566,050		480,154
Other investments	907,875		304,275
Cash and other assets	814,044		1,329,990
Total assets	2,994,798		2,872,844
Loan Participations
Debt Instrument [Line Items]
Performing Loans	$ 35,600		$ 22,500

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