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RISK MANAGEMENT (Details 20) - Market Risk [Member] - USD [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Consolidated [Member] | Top of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk $ 5,230 $ 5,710
Consolidated [Member] | Bottom of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 1,210 1,560
Consolidated [Member] | Weighted Average [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 2,010 3,010
Fixed-Income Investments [Member] | Top of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 2,540 5,510
Fixed-Income Investments [Member] | Bottom of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 1,190 1,150
Fixed-Income Investments [Member] | Weighted Average [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 1,710 2,360
Variable-Income Investments [Member] | Top of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 10 10
Variable-Income Investments [Member] | Bottom of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 0 0
Variable-Income Investments [Member] | Weighted Average [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 0 0
Foreign Currency Investments [Member] | Top of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 4,290 4,210
Foreign Currency Investments [Member] | Bottom of Range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk 90 530
Foreign Currency Investments [Member] | Weighted Average [Member]    
Disclosure of detailed information about financial instruments [line items]    
Value at risk $ 1,140 $ 1,710