DERIVATIVE INSTRUMENTS (Schedule of Interest Rate Swap Derivatives) (Details) - Designated as Hedging Instrument	Dec. 31, 2017 USD ($)
Interest Rate Swap
Derivative [Line Items]
Current Notional Amount	$ 1,050,000,000
Cash Flow Hedging
Derivative [Line Items]
Estimated Fair Value	592,000
Cash Flow Hedging | 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	$ 675,000
Cash Flow Hedging | 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	$ 672,000
Cash Flow Hedging | 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	$ 318,000
Cash Flow Hedging | 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	$ 779,000
Cash Flow Hedging | 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	$ 858,000
Cash Flow Hedging | 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	$ 337,000
Cash Flow Hedging | 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	$ (455,000)
Cash Flow Hedging | 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	$ (434,000)
Cash Flow Hedging | 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	$ (684,000)
Cash Flow Hedging | 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	$ (255,000)
Cash Flow Hedging | 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	$ (1,219,000)