DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Summary of the Notional Amount and Fair Value of Derivatives) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 21, 2018
Fair value of derivative instruments
Total fair value derivative assets	$ 0	$ 346,000
Total fair value derivative liabilities	(24,160,000)	(16,517,000)
Interest Rate Cap | Derivative instruments not designated as hedging instruments | Fixed Interest Rate 2.50%, Maturing December 2019
Fair value of derivative instruments
Interest income	200,000	200,000
Interest Rate Cap | Derivative instruments not designated as hedging instruments | Prepaid expenses and other assets, net | Fixed Interest Rate 5.0 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 | Derivative instruments not designated as hedging instruments | Prepaid expenses and other assets, net | 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 Rate Cap | Derivative instruments designated as hedging instruments
Fair value of derivative instruments
Notional amount	230,000,000.0
Interest Rate Collar | Derivative instruments designated as hedging instruments | Prepaid expenses and other assets, net | Fixed Interest Rate 1.50% To 2.50%, Maturing May 2019
Fair value of derivative instruments
Notional amount	51,353,000
Total fair value derivative assets	0	13,000
Interest Rate Collar | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | Fixed Interest Rate 2.00% To 3.00%, Maturing May 2020
Fair value of derivative instruments
Notional amount	193,967,000
Total fair value derivative liabilities	(57,000)	(37,000)
Interest Rate Collar | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | Fixed Interest Rate 2.25% To 3.25%, Maturing May 2021
Fair value of derivative instruments
Notional amount	354,217,000
Total fair value derivative liabilities	(1,055,000)	(730,000)
Interest Rate Collar | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022
Fair value of derivative instruments
Notional amount	381,404,000
Total fair value derivative liabilities	(2,719,000)	(1,969,000)
Interest rate derivatives | Derivative instruments designated as hedging instruments
Fair value of derivative instruments
Notional amount		250,000,000.0
Interest rate derivatives | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | Fixed Interest Rate 2.96%, Maturing September 2023
Fair value of derivative instruments
Notional amount	$ 615,000,000
Fixed Interest Rate	2.96%
Total fair value derivative liabilities	$ (20,329,000)	$ (13,781,000)
Minimum | Interest Rate Collar | Derivative instruments designated as hedging instruments | Prepaid expenses and other assets, net | 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 | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | 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 | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | 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 | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | 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 | Derivative instruments designated as hedging instruments | Prepaid expenses and other assets, net | 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 | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | 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 | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | 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 | Derivative instruments designated as hedging instruments | Accounts payable and accrued expenses | Fixed Interest Rate 2.75% To 3.50%, Maturing April 2022
Fair value of derivative instruments
Fixed Interest Rate	3.50%
Term Loan | $700 Million Loan Maturity September 2023
Fair value of derivative instruments
Loan amount			$ 615,000,000.0