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FINANCIAL INSTRUMENTS - Interest Rate Swap Transactions (Details) - Interest rate swap - Cash flow hedging - Designated as Hedging Instrument - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Notional value | $ 737,500 | $ 950,000
Minimum | LIBOR |  |
Derivative [Line Items] |  |
Fixed interest rates | 1.68% | 1.23%
Maximum | LIBOR |  |
Derivative [Line Items] |  |
Fixed interest rates | 2.37% | 1.94%

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