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DERIVATIVES - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) N | Jun. 30, 2019 USD ($) N | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Net interest expense | $ (31,971,000) |  | $ (29,268,000) | $ (63,718,000) | $ (59,275,000) |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | 270,000,000.0 |  |  | 270,000,000.0 |  | $ 245,000,000.0
Net interest expense | 1,100,000 |  | 290,000 | 1,300,000 | 625,000 |
Unrealized after-tax gain of accumulated other comprehensive income (loss) |  | $ 26,000 | 189,000 |  |  |
Interest income | $ 9,000 |  | $ 31,000 | $ 80,000 | $ 62,000 |
Derivative number of instruments terminated | N |  | 3 | 4 |  |  |

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