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FINANCIAL INSTRUMENTS - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2020 USD ($) $ / shares shares | Nov. 30, 2019 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / barrel | Jul. 31, 2013 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Stock repurchased during period (in shares) | shares | 1,500,000 |  | 3,500,000 | 0 |  |
Treasury shares repurchased | shares | 3,500,000 |  |  |  |  |
Cash collateral |  |  | $ 163,181,000 | $ 188,289,000 |  |
Investments, ownership percentage |  |  | 100.00% |  |  |
Investments in affiliates |  |  | $ 312,151,000 | 508,805,000 | $ 571,782,000 |
Golar Partners |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Purchase of limited partners units | shares | 107,000 |  |  |  |  |
Price per share, average (USD per share) | $ / shares | $ 21.40 |  |  |  |  |
Share Repurchase Forward Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Collateral required under share repurchase agreement, percentage of total purchase price |  |  | 20.00% |  |  |
Cash collateral |  |  | $ 0 | 55,600,000 |  |
Interest rate swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash collateral |  |  | $ 8,864,000 | $ 0 |  |
Golar Partners |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Investments, ownership percentage |  |  | 32.80% | 32.00% |  |
Investments in affiliates |  |  | $ 67,429,000 | $ 214,296,000 |  |
Ownership percentage |  |  | 32.80% | 32.00% |  |
Hygo |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Investments in affiliates |  |  | $ 200,337,000 | $ 261,693,000 |  |
Ownership percentage |  |  | 50.00% | 50.00% |  |
Avenir LNG Limited (“Avenir”) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Investments in affiliates |  |  | $ 39,984,000 | $ 28,101,000 |  |
Ownership percentage |  |  | 23.10% | 22.50% |  |
Line of Credit | $1.125 billion newbuild facility | Secured Debt |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash collateral |  |  | $ 2,615,000 | $ 10,975,000 |  |
Maximum borrowing capacity |  |  | 1,125,000,000 |  |  | $ 1,125,000,000
Oil derivative instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, floor price (in usd/barrel) | $ / barrel |  |  |  |  | 60.00 |
Equity Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stock repurchased during period (in shares) | shares | 1,500,000 | 1,500,000 |  |  |  |
Derivative, fair value, net | $ 72,700,000 | $ 69,500,000 |  |  |  |
Derivative liability, fair value of collateral | 59,300,000 | 54,700,000 |  |  |  |
Notional value | $ 55,500,000 | 50,900,000 |  |  |  |
Shares acquired by counterparty (in shares) | shares |  |  |  | 1,500,000 |  |
Shares acquired by counterparty, per share price (in dollars per share) | $ / shares |  |  |  | $ 46.93 |  |
Price per share, average (USD per share) | $ / shares | $ 46.91 |  |  |  |  |
Loss on derivative |  |  | $ 5,100,000 |  |  |
Equity Swap | Golar Partners |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, fair value, net | $ 500,000 |  |  |  |  |
Equity Swap | Treasury Shares |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional value | $ 17,200,000 | $ 18,600,000 |  |  |  |
Golar Partners |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Indexed Shares | shares |  |  |  | 107,000 |  |
Forward contract to purchase shares, average price per share (in dollars per share) | $ / shares |  |  |  | $ 21.41 |  |

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