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FINANCIAL INSTRUMENTS - Interest Rate Risk Management (Details) $ / shares in Units, $ in Thousands | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares $ / barrel | Dec. 31, 2016 USD ($)
Mark-to-market swaps valuation: |  |  |
Investment in affiliates | $ 571,782 | $ 703,225 | $ 648,780
Energy Related Derivative |  |  |
Mark-to-market swaps valuation: |  |  |
Derivative, floor price (in usd/barrel) | $ / barrel |  | 60.00 |
Equity Swap |  |  |
Mark-to-market swaps valuation: |  |  |
Shares acquired by counterparty (in shares) | shares | 3,000,000 |  |
Shares acquired by counterparty, per share price (in dollars per share) | $ / shares | $ 45.01 | $ 45.01 |
Loss on derivative | $ 30,700 |  |
Designated as Hedging Instrument | Interest rate swap | Cash flow hedging |  |  |
Mark-to-market swaps valuation: |  |  |
Notional value | $ 950,000 | $ 1,250,000 |
Designated as Hedging Instrument | Interest rate swap | Cash flow hedging | Minimum |  |  |
Mark-to-market swaps valuation: |  |  |
Fixed interest rate | 1.23% | 1.13% |
Designated as Hedging Instrument | Interest rate swap | Cash flow hedging | Maximum |  |  |
Mark-to-market swaps valuation: |  |  |
Fixed interest rate | 1.94% | 1.94% |
Golar Partners |  |  |
Mark-to-market swaps valuation: |  |  |
Forward contract to purchase shares (in shares) | shares | 107,000 |  |
Forward contract to purchase shares, average price per share (in dollars per share) | $ / shares | $ 20.53 |  |

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