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DERIVATIVE INSTRUMENTS - Schedule of Derivatives (Details) - Cash Flow Hedging - Designated as Hedging Instrument | Sep. 30, 2018 USD ($)
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Derivative [Line Items] |
Current Notional Amount | $ 1,050,000,000
Estimated Fair Value, Assets (Liabilities) | 26,929,000
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) | $ 588,000
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) | $ 924,000
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) | $ 590,000
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) | $ 637,000
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) | $ 1,950,000
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) | $ 2,342,000
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) | $ 4,322,000
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) | $ 4,277,000
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) | $ 2,786,000
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) | $ 1,339,000
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) | $ 7,174,000

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