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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