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DERIVATIVE INSTRUMENTS - Schedule of Derivatives (Details) - Cash Flow Hedges - Designated as Hedging Instrument - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Current Notional Amount	$ 1,475,000,000
Estimated Fair Value, Assets (Liabilities)	(57,185,000)	$ 619,000
3-Month USD LIBOR | Interest Rate Swap Designated June 22, 2016 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 50,000,000
Fixed Interest Rate	1.062%
Estimated Fair Value, Assets (Liabilities)	$ 0	410,000
3-Month USD LIBOR | Interest Rate Swap Designated June 22, 2016 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 50,000,000
Fixed Interest Rate	1.062%
Estimated Fair Value, Assets (Liabilities)	$ 0	415,000
3-Month USD LIBOR | Interest Rate Swap Designated February 6, 2017 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 50,000,000
Fixed Interest Rate	1.834%
Estimated Fair Value, Assets (Liabilities)	$ 23,000	619,000
1-Month USD LIBOR | Interest Rate Swap Designated July 12, 2016
Derivative [Line Items]
Current Notional Amount	$ 50,000,000
Fixed Interest Rate	0.825%
Estimated Fair Value, Assets (Liabilities)	$ 0	418,000
1-Month USD LIBOR | Interest Rate Swap Designated February 6, 2017 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 100,000,000
Fixed Interest Rate	1.652%
Estimated Fair Value, Assets (Liabilities)	$ 45,000	1,287,000
1-Month USD LIBOR | Interest Rate Swap Designated March 27, 2017
Derivative [Line Items]
Current Notional Amount	$ 100,000,000
Fixed Interest Rate	1.971%
Estimated Fair Value, Assets (Liabilities)	$ (769,000)	1,246,000
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 150,000,000
Fixed Interest Rate	2.201%
Estimated Fair Value, Assets (Liabilities)	$ (3,647,000)	1,491,000
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 150,000,000
Fixed Interest Rate	2.201%
Estimated Fair Value, Assets (Liabilities)	$ (3,612,000)	1,460,000
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 3
Derivative [Line Items]
Current Notional Amount	$ 100,000,000
Fixed Interest Rate	2.423%
Estimated Fair Value, Assets (Liabilities)	$ (4,463,000)	418,000
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 4
Derivative [Line Items]
Current Notional Amount	$ 50,000,000
Fixed Interest Rate	2.423%
Estimated Fair Value, Assets (Liabilities)	$ (2,268,000)	162,000
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 5
Derivative [Line Items]
Current Notional Amount	$ 200,000,000
Fixed Interest Rate	2.313%
Estimated Fair Value, Assets (Liabilities)	$ (8,702,000)	2,076,000
1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 75,000,000
Fixed Interest Rate	3.22%
Estimated Fair Value, Assets (Liabilities)	$ (6,798,000)	(2,594,000)
1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 75,000,000
Fixed Interest Rate	3.199%
Estimated Fair Value, Assets (Liabilities)	$ (6,786,000)	(2,551,000)
1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 3
Derivative [Line Items]
Current Notional Amount	$ 75,000,000
Fixed Interest Rate	3.209%
Estimated Fair Value, Assets (Liabilities)	$ (6,896,000)	(2,568,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 18, 2018 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 100,000,000
Fixed Interest Rate	2.885%
Estimated Fair Value, Assets (Liabilities)	$ (6,683,000)	(797,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 18, 2018 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 100,000,000
Fixed Interest Rate	2.867%
Estimated Fair Value, Assets (Liabilities)	$ (6,629,000)	$ (873,000)

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