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FINANCIAL INSTRUMENTS - Interest Rate Risk Management (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Dec. 31, 2016
item
Dec. 31, 2017
USD ($)
item
May 02, 2016
item
Early adoption | ASU 2017-12 | Adjustment        
Interest Rate Swap Agreements        
Cumulative ineffectiveness recognized from the new designation     $ 2,600  
Interest rate swap        
Interest Rate Swap Agreements        
Number of interest rate swap transactions | item       6
Payment received from swap counterparties $ 18,200   18,200  
Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Fair market value of revised swaps $ 0      
Amounts in accumulated other comprehensive income expected to be reclassified into earings in the coming 12 months     $ 4,100  
Interest rate swap | Cash flow hedges | Minimum        
Interest Rate Swap Agreements        
Swap offsetting percentage of hedged interest payments     80.00%  
Interest rate swap | Cash flow hedges | Maximum        
Interest Rate Swap Agreements        
Swap offsetting percentage of hedged interest payments     125.00%  
Refinancing Facility | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Number of interest rate swap transactions | item     2  
Number of swap agreements with payment dates modified | item   2    
Percentage of fixed interest rate on aggregate variable interest rate borrowings     54.00%  
Refinancing Facility One | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Initial aggregate notional amount     $ 81,269  
Derivative, Fixed Interest Rate     1.66%  
Refinancing Facility Two | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Initial aggregate notional amount     $ 20,317  
Derivative, Fixed Interest Rate     1.648%  
Korean Export Credit Facility | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Number of interest rate swap transactions | item     3  
Percentage of fixed interest rate on aggregate variable interest rate borrowings     92.00%  
Initial aggregate notional amount     $ 599,700  
Maximum aggregate notional amount     610,000  
Korean Export Credit Facility One | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Initial aggregate notional amount     $ 488,000  
Derivative, Fixed Interest Rate     1.838%  
Korean Export Credit Facility Two | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Initial aggregate notional amount     $ 91,500  
Derivative, Fixed Interest Rate     1.8645%  
Korean Export Credit Facility Three | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Initial aggregate notional amount     $ 30,500  
Derivative, Fixed Interest Rate     1.818%  
Sinosure Credit Facility | Interest rate swap | Cash flow hedges        
Interest Rate Swap Agreements        
Percentage of fixed interest rate on aggregate variable interest rate borrowings     100.00%  
Initial aggregate notional amount     $ 316,863  
Derivative, Fixed Interest Rate     2.047%