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DERIVATIVE INSTRUMENTS (Details) | 8 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) derivative_instrument | Dec. 31, 2017 USD ($) | Apr. 30, 2018 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Jan. 31, 2023 USD ($) derivative_instrument
Derivative [Line Items] |  |  |  |  |  |
Cash flow hedge gain (loss) to be reclassified within twelve months | $ 61,000 |  |  |  |  |
Interest expense | 21,359,000 | $ 22,804,000 | $ 34,178,000 | $ 34,314,000 | $ 28,417,000 |
Net income (loss) | (5,320,000) | $ 140,594,000 | 127,629,000 | 30,525,000 | $ 76,602,000 |
Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument - interest rate swap | 818,000 |  | 1,779,000 | 0 |  |
Derivative Liability | 1,675,000 |  | 0 | 0 |  |
Gain (Loss) Recognized in OCI | (2,794,000) |  | 1,627,000 | 0 |  |
Designated as Hedging Instrument | Interest Rate Contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI | $ (2,794,000) |  | 1,627,000 | 0 |  |
Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of instruments held | derivative_instrument | 2 |  |  |  |  |
Notional amount | $ 145,000,000 |  |  |  |  |
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net income (loss) | (159,000) |  | (152,000) | 0 |  |
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest expense | (159,000) |  | (152,000) | 0 |  |
Other Assets | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument - interest rate swap | 818,000 |  | 1,779,000 | 0 |  |
Accounts Payable and Accrued Expenses | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Liability | $ 1,675,000 |  | $ 0 | $ 0 |  |
Scenario, Forecast | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of instruments held | derivative_instrument |  |  |  |  |  | 1
Notional amount |  |  |  |  |  | $ 70,000,000

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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