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Subsequent Events (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Jan. 29, 2019	Jan. 22, 2019	Dec. 31, 2018	Dec. 31, 2018	Feb. 28, 2019	May 01, 2018
Subsequent Event [Line Items]
Commitment to fund partnership			$ 36,000	$ 57,000
Commitment to fund partnership, funded amount			$ 36,000	36,000
Issuance of common stock				$ 142,228
Subsequent Event
Subsequent Event [Line Items]
Commitment to fund partnership, funded amount					$ 7,000
Issuance of common stock (in shares)	11,500,000
Issuance of common stock	$ 177,000
5 Arches, LLC
Subsequent Event [Line Items]
Option to purchase additional equity, amount						$ 40,000
Minority interest, percentage			20.00%	20.00%		20.00%
5 Arches, LLC | Subsequent Event
Subsequent Event [Line Items]
Option to purchase additional equity, percent		80.00%
Light-Renovation Multifamily Loans | Subsequent Event
Subsequent Event [Line Items]
Loans to be acquired by limited partnership, amount	1,000,000
Commitment to fund partnership	$ 78,000
Commitment to fund partnership, funded amount					$ 20,000

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