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DERIVATIVE INSTRUMENTS - Schedule of Derivatives (Details) - Cash Flow Hedges - Designated as Hedging Instrument - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Derivative [Line Items] |  |
Estimated Fair Value, Asset (Liability) | $ (54,814,000) | $ (93,769,000)
1-Month USD LIBOR |  |
Derivative [Line Items] |  |
Notional amount | 1,775,000,000 | 1,875,000,000
1-Month USD LIBOR | Interest Rate Swap Designated March 27, 2017 |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | 100,000,000
Fixed Interest Rate | 1.971% |
Estimated Fair Value, Asset (Liability) | $ 0 | (929,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 1 |  |
Derivative [Line Items] |  |
Notional amount | $ 300,000,000 | 300,000,000
Fixed Interest Rate | 2.201% |
Estimated Fair Value, Asset (Liability) | $ (7,693,000) | (12,557,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 3 |  |
Derivative [Line Items] |  |
Notional amount | $ 150,000,000 | 150,000,000
Fixed Interest Rate | 2.423% |
Estimated Fair Value, Asset (Liability) | $ (7,859,000) | (11,502,000)
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) | $ (10,795,000) | (16,243,000)
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) | $ (6,964,000) | (9,836,000)
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) | $ (6,931,000) | (9,826,000)
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) | $ (6,906,000) | (9,783,000)
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) | $ (7,253,000) | (10,407,000)
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) | $ (7,211,000) | (10,431,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 15, 2020 Tranche 1 |  |
Derivative [Line Items] |  |
Notional amount | $ 575,000,000 | 575,000,000
Fixed Interest Rate | 1.415% |
Estimated Fair Value, Asset (Liability) | $ 5,483,000 | (1,907,000)
1-Month USD LIBOR | Interest Rate Swap Designated December 15, 2020 Tranche 2 |  |
Derivative [Line Items] |  |
Notional amount | $ 125,000,000 | 125,000,000
Fixed Interest Rate | 1.404% |
Estimated Fair Value, Asset (Liability) | $ 1,315,000 | $ (348,000)

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