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FINANCIAL INSTRUMENTS (Schedule of fair values of derivative instruments designated and not designated as cash flow hedges) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Derivative instrument, long-term assets $ 3,675 $ 3,406
Financial instruments at fair value, current portion 1,714 1,572
Financial instruments at fair value, long-term portion 21,357 32,712
Interest rate swaps | Designated as hedging instrument    
Derivative [Line Items]    
Derivative instrument, long-term assets 587 0
Financial instruments at fair value, current portion 369 703
Financial instruments at fair value, long-term portion 4,755 7,926
Interest rate swaps | Not designated as hedging instrument    
Derivative [Line Items]    
Financial instruments at fair value, current portion 1,345 869
Financial instruments at fair value, long-term portion 6,068 13,479
Cross currency swaps | Designated as hedging instrument    
Derivative [Line Items]    
Derivative instrument, long-term assets 2,988 3,373
Financial instruments at fair value, long-term portion 8,288 8,301
Cross currency swaps | Not designated as hedging instrument    
Derivative [Line Items]    
Derivative instrument, long-term assets 7 5
Cross currency interest rate swaps | Designated as hedging instrument    
Derivative [Line Items]    
Derivative instrument, long-term assets 93 28
Financial instruments at fair value, long-term portion $ 2,246 $ 3,006