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DERIVATIVE INSTRUMENTS (Schedule of Interest Rate Swap Derivatives) (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional Amount	$ 1,875,000,000	$ 1,325,000,000
Estimated Fair Value	(93,769,000)	(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	$ 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	$ 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	$ (929,000)	(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	$ (6,152,000)	(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	$ (6,405,000)	(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	$ (7,724,000)	(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	$ (3,778,000)	(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	$ (16,243,000)	(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	$ (9,836,000)	(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	$ (9,826,000)	(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	$ (9,783,000)	(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	$ (10,407,000)	(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	$ (10,431,000)	(4,691,000)
1-month USD LIBOR | Interest Rate Swap Designated December 15, 2020 Tranche 1
Derivative [Line Items]
Notional Amount	$ 125,000,000	0
Fixed Interest Rate	1.415%
Estimated Fair Value	$ (382,000)	0
1-month USD LIBOR | Interest Rate Swap Designated December 15, 2020 Tranche 2
Derivative [Line Items]
Notional Amount	$ 50,000,000	0
Fixed Interest Rate	1.404%
Estimated Fair Value	$ (162,000)	0
1-month USD LIBOR | Interest Rate Swap Designated December 15, 2020 Tranche 3
Derivative [Line Items]
Notional Amount	$ 225,000,000	0
Fixed Interest Rate	1.415%
Estimated Fair Value	$ (846,000)	0
1-month USD LIBOR | Interest Rate Swap Designated December 15, 2020 Tranche 4
Derivative [Line Items]
Notional Amount	$ 225,000,000	0
Fixed Interest Rate	1.415%
Estimated Fair Value	$ (679,000)	0
1-month USD LIBOR | Interest Rate Swap Designated December 15, 2020 Tranche 5
Derivative [Line Items]
Notional Amount	$ 75,000,000	0
Fixed Interest Rate	1.404%
Estimated Fair Value	$ (187,000)	$ 0

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-Publisher FASB
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