DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Summary of the Notional Amount and Fair Value of Derivatives) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Aug. 01, 2019	Jun. 27, 2019	May 23, 2019	May 01, 2019	Sep. 21, 2018	Sep. 18, 2018
Fair value of derivative instruments
Total fair value derivative assets	$ 0	$ 346,000
Total fair value derivative liabilities	(40,135,000)	(16,517,000)
Interest Rate Cap | Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets | Fixed Interest Rate 2.50%, Maturing December 2019
Fair value of derivative instruments
Notional amount	$ 230,000,000
Fixed interest rate	2.50%
Total fair value derivative assets	$ 0	333,000
Interest income	200,000	200,000
Interest Rate Cap | Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets | Fixed Interest Rate 5.00% Maturing August 2019
Fair value of derivative instruments
Notional amount	$ 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	230,000,000.0
Interest Rate Collar | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets | Fixed Interest Rate 1.50% To 2.50%, Maturing May 2019
Fair value of derivative instruments
Notional amount						$ 51,592,000
Total fair value derivative assets	0	13,000
Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.00% To 3.00%, Maturing May 2020
Fair value of derivative instruments
Notional amount, liability	193,967,000
Total fair value derivative liabilities	(182,000)	(37,000)
Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.25% To 3.25%, Maturing May 2021
Fair value of derivative instruments
Notional amount, liability	354,217,000
Total fair value derivative liabilities	(2,074,000)	(730,000)
Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022
Fair value of derivative instruments
Notional amount, liability	381,404,000
Total fair value derivative liabilities	$ (4,578,000)	(1,969,000)
Interest rate swap contracts | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.96% Maturing September 2023
Fair value of derivative instruments
Fixed interest rate	2.96%
Notional amount, liability	$ 615,000,000
Total fair value derivative liabilities	$ (31,187,000)	(13,781,000)
Interest rate swap contracts | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 4.89% Maturing September 2024
Fair value of derivative instruments
Fixed interest rate	4.89%
Notional amount, liability	$ 1,810,000
Total fair value derivative liabilities	$ (2,114,000)	$ 0
Minimum | Interest Rate Collar | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets | Fixed Interest Rate 1.50% To 2.50%, Maturing May 2019
Fair value of derivative instruments
Fixed interest rate	1.50%
Minimum | Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.00% To 3.00%, Maturing May 2020
Fair value of derivative instruments
Fixed interest rate	2.00%
Minimum | Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.25% To 3.25%, Maturing May 2021
Fair value of derivative instruments
Fixed interest rate	2.25%
Minimum | Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022
Fair value of derivative instruments
Fixed interest rate	2.75%
Maximum | Interest Rate Collar | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets | Fixed Interest Rate 1.50% To 2.50%, Maturing May 2019
Fair value of derivative instruments
Fixed interest rate	2.50%
Maximum | Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.00% To 3.00%, Maturing May 2020
Fair value of derivative instruments
Fixed interest rate	3.00%
Maximum | Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.25% To 3.25%, Maturing May 2021
Fair value of derivative instruments
Fixed interest rate	3.25%
Maximum | Interest Rate Collar | Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022
Fair value of derivative instruments
Fixed interest rate	3.50%
$700 Million Loan Maturity September 2023
Fair value of derivative instruments
Fixed interest rate							4.61%
Aggregate principal amount of debt issued								$ 700,000,000.0
Term Loan | $700 Million Loan Maturity September 2023
Fair value of derivative instruments
Aggregate principal amount of debt issued							$ 615,000,000.0	$ 615,000,000.0
Construction Loans
Fair value of derivative instruments
Aggregate principal amount of debt issued			$ 64,600,000		$ 512,600,000
8770 New Trails | Construction Loans
Fair value of derivative instruments
Aggregate principal amount of debt issued				$ 35,500,000