DERIVATIVE INSTRUMENTS - Schedule of Derivatives (Details) - Cash Flow Hedges - Designated as Hedging Instrument - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional Amount	$ 1,175,000,000	$ 1,325,000,000
Estimated Fair Value, Asset (Liability)	(100,380,000)	(45,145,000)
3-Month USD LIBOR | Interest Rate Swap Designated February 6, 2017 Tranche 1
Derivative [Line Items]
Notional Amount	$ 0	50,000,000
Fixed Interest Rate	1.834%
Estimated Fair Value, Asset (Liability)	$ 0	(2,000)
1-Month USD LIBOR | Interest Rate Swap Designated February 6, 2017 Tranche 2
Derivative [Line Items]
Notional Amount	$ 0	100,000,000
Fixed Interest Rate	1.652%
Estimated Fair Value, Asset (Liability)	$ 0	12,000
1-Month USD LIBOR | Interest Rate Swap Designated March 27, 2017
Derivative [Line Items]
Notional Amount	$ 100,000,000	100,000,000
Fixed Interest Rate	1.971%
Estimated Fair Value, Asset (Liability)	$ (1,377,000)	(581,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 1
Derivative [Line Items]
Notional Amount	$ 150,000,000	150,000,000
Fixed Interest Rate	2.201%
Estimated Fair Value, Asset (Liability)	$ (6,901,000)	(2,880,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 2
Derivative [Line Items]
Notional Amount	$ 150,000,000	150,000,000
Fixed Interest Rate	2.201%
Estimated Fair Value, Asset (Liability)	$ (6,922,000)	(2,880,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 3
Derivative [Line Items]
Notional Amount	$ 100,000,000	100,000,000
Fixed Interest Rate	2.423%
Estimated Fair Value, Asset (Liability)	$ (8,454,000)	(3,517,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 4
Derivative [Line Items]
Notional Amount	$ 50,000,000	50,000,000
Fixed Interest Rate	2.423%
Estimated Fair Value, Asset (Liability)	$ (4,064,000)	(1,778,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 5
Derivative [Line Items]
Notional Amount	$ 200,000,000	200,000,000
Fixed Interest Rate	2.313%
Estimated Fair Value, Asset (Liability)	$ (18,188,000)	(6,595,000)
1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 1
Derivative [Line Items]
Notional Amount	$ 75,000,000	75,000,000
Fixed Interest Rate	3.22%
Estimated Fair Value, Asset (Liability)	$ (10,608,000)	(5,750,000)
1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 2
Derivative [Line Items]
Notional Amount	$ 75,000,000	75,000,000
Fixed Interest Rate	3.199%
Estimated Fair Value, Asset (Liability)	$ (10,871,000)	(5,747,000)
1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 3
Derivative [Line Items]
Notional Amount	$ 75,000,000	75,000,000
Fixed Interest Rate	3.209%
Estimated Fair Value, Asset (Liability)	$ (10,586,000)	(5,807,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 18, 2018 Tranche 1
Derivative [Line Items]
Notional Amount	$ 100,000,000	100,000,000
Fixed Interest Rate	2.885%
Estimated Fair Value, Asset (Liability)	$ (11,282,000)	(4,930,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 18, 2018 Tranche 2
Derivative [Line Items]
Notional Amount	$ 100,000,000	100,000,000
Fixed Interest Rate	2.867%
Estimated Fair Value, Asset (Liability)	$ (11,127,000)	$ (4,691,000)