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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 03, 2017	Mar. 31, 2019	Mar. 05, 2019	Dec. 12, 2018	Mar. 13, 2017	Oct. 18, 2016
RELATED PARTY TRANSACTIONS
Fees for legal expenses		$ 200
Compensation amount (more than)		120
Affiliated Entity
RELATED PARTY TRANSACTIONS
Investment in mutual fund		$ 800				$ 10,000
Fee earned on assets under management (as percentage)		0.75%
Fund's cap expense (as percentage)		0.95%
Affiliated Entity | Related Reserve IV LLC | B Participation Interest
RELATED PARTY TRANSACTIONS
Mortgage loan participation purchased by related party					$ 4,000
Participating mortgage loan amount (up to)					$ 136,500
Percentage of loans receivable with fixed rates of interest					17.00%
Affiliated Entity | Brickell Heights Commercial LLC | First mortgage loan
RELATED PARTY TRANSACTIONS
Loans receivable from related party			$ 14,300	$ 6,400
Consolidated Joint Venture | The Related Group of Florida | First mortgage loan
RELATED PARTY TRANSACTIONS
Interest income, related party		$ 100
Brickell Heights Commercial LLC | Consolidated Joint Venture | Related Special Assets LLC
RELATED PARTY TRANSACTIONS
Ownership Interest (percent)			0.68%	12.00%
Class A Common Stock | Related
RELATED PARTY TRANSACTIONS
Related party purchases of shares from shareholders	$ 80,000
Participation Financing - Mortgage Loan Receivable | Affiliated Entity | Related Reserve IV LLC | B Participation Interest
RELATED PARTY TRANSACTIONS
Interest expense, debt		$ 100

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