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DERIVATIVE INSTRUMENTS - Schedule of Derivatives (Details) - Cash Flow Hedges - Designated as Hedging Instrument - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |
Notional Amount | $ 1,175,000,000 | $ 1,325,000,000
Estimated Fair Value, Asset (Liability) | (100,380,000) | (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, Asset (Liability) | $ 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, Asset (Liability) | $ 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, Asset (Liability) | $ (1,377,000) | (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, Asset (Liability) | $ (6,901,000) | (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, Asset (Liability) | $ (6,922,000) | (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, Asset (Liability) | $ (8,454,000) | (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, Asset (Liability) | $ (4,064,000) | (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, Asset (Liability) | $ (18,188,000) | (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, Asset (Liability) | $ (10,608,000) | (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, Asset (Liability) | $ (10,871,000) | (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, Asset (Liability) | $ (10,586,000) | (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, Asset (Liability) | $ (11,282,000) | (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, Asset (Liability) | $ (11,127,000) | $ (4,691,000)

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