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DERIVATIVE INSTRUMENTS - Schedule of Derivatives (Details) - Cash Flow Hedges - Designated as Hedging Instrument - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Derivative [Line Items] |  |
Current Notional Amount | $ 1,475,000,000 |
Estimated Fair Value, Assets (Liabilities) | (43,161,000) | $ 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) | $ 71,000 | 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) | $ 204,000 | 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) | $ (608,000) | 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) | $ (2,901,000) | 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) | $ (2,873,000) | 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) | $ (3,497,000) | 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) | $ (1,787,000) | 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) | $ (6,363,000) | 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) | $ (5,583,000) | (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) | $ (5,600,000) | (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) | $ (5,632,000) | (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) | $ (4,328,000) | (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) | $ (4,264,000) | $ (873,000)

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