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FINANCIAL RISK MANAGEMENT (Credit risk narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]    
Trade receivables $ 1,133,236  
Credit risk    
Disclosure of credit risk exposure [line items]    
Financial assets, investments assessed as investment grade, percent 82.60% 75.70%
Trade receivables $ 1,033,200 $ 1,011,400
Allowance for doubtful account 14,300 16,500
Financing Receivables, Equal to Greater than 1 Day Past Due | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 112,500 117,300
Performing Financial Instruments | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 1,035,000 910,700
Performance Guarantee | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 23,300 2,600
Credit Insurance | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 506,800 380,000
Guarantee Type, Other | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 18,600 $ 15,000