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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