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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Summary of the Notional Amount and Fair Value of Derivatives) (Details) - USD ($)	Dec. 31, 2020	May 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 21, 2018	Sep. 18, 2018
Fair value of derivative instruments
Total fair value derivative assets	$ 0		$ 0
Total fair value derivative liabilities	(51,920,000)		(40,135,000)
Total fair value derivatives, net	(51,920,000)		(40,135,000)
$700 Million Loan Maturity September 2023
Fair value of derivative instruments
Aggregate principal amount of debt issued						$ 700,000,000.0
Term Loan \| $700 Million Loan Maturity September 2023
Fair value of derivative instruments
Fixed interest rate					4.61%
Aggregate principal amount of debt issued	615,000,000.0			$ 615,000,000.0		$ 615,000,000.0
Construction Loans \| 8770 New Trails
Fair value of derivative instruments
Aggregate principal amount of debt issued			35,500,000
Interest Rate Cap \| Not Designated as Hedging Instrument \| Fixed Interest Rate 5.00% Maturing October 2022 \| Prepaid expenses and other assets, net
Fair value of derivative instruments
Notional amount, asset	$ 75,000,000
Fixed interest rate	5.00%
Total fair value derivative assets	$ 0		0
Interest Rate Cap \| Designated as Hedging Instrument
Fair value of derivative instruments
Notional amount, asset			230,000,000.0
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.00% To 3.00% Maturing May 2020 \| Prepaid expenses and other assets, net
Fair value of derivative instruments
Notional amount, liability		$ 194,000,000.0
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.00% To 3.00% Maturing May 2020 \| Accounts payable and accrued expenses
Fair value of derivative instruments
Notional amount, liability			193,967,000
Total fair value derivative liabilities	0		$ (182,000)
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.00% To 3.00% Maturing May 2020 \| Accounts payable and accrued expenses \| Minimum
Fair value of derivative instruments
Fixed interest rate			2.00%
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.00% To 3.00% Maturing May 2020 \| Accounts payable and accrued expenses \| Maximum
Fair value of derivative instruments
Fixed interest rate			3.00%
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.25% To 3.25%, Maturing May 2021 \| Accounts payable and accrued expenses
Fair value of derivative instruments
Notional amount, liability	354,217,000
Total fair value derivative liabilities	$ 0		$ (2,074,000)
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.25% To 3.25%, Maturing May 2021 \| Accounts payable and accrued expenses \| Minimum
Fair value of derivative instruments
Fixed interest rate	2.25%
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.25% To 3.25%, Maturing May 2021 \| Accounts payable and accrued expenses \| Maximum
Fair value of derivative instruments
Fixed interest rate	3.25%
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022 \| Accounts payable and accrued expenses
Fair value of derivative instruments
Notional amount, liability	$ 381,404,000
Total fair value derivative liabilities	$ 0		(4,578,000)
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022 \| Accounts payable and accrued expenses \| Minimum
Fair value of derivative instruments
Fixed interest rate	2.75%
Interest Rate Collar \| Designated as Hedging Instrument \| Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022 \| Accounts payable and accrued expenses \| Maximum
Fair value of derivative instruments
Fixed interest rate	3.50%
Interest Rate Swap \| Designated as Hedging Instrument \| Fixed Interest Rate 2.96% Maturing September 2023 \| Accounts payable and accrued expenses
Fair value of derivative instruments
Notional amount, liability	$ 615,000,000
Fixed interest rate	2.96%
Total fair value derivative liabilities	$ (46,613,000)		(31,187,000)
Interest Rate Swap \| Designated as Hedging Instrument \| Fixed Interest Rate 4.89% Maturing January 2032 \| Accounts payable and accrued expenses
Fair value of derivative instruments
Notional amount, liability	$ 34,918,000
Fixed interest rate	4.89%
Total fair value derivative liabilities	$ (5,307,000)		$ (2,114,000)