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FINANCIAL RISK MANAGEMENT (Credit risk narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of credit risk exposure [line items]    
Trade receivables $ 918,438 $ 950,569
Credit risk    
Disclosure of credit risk exposure [line items]    
Financial assets, investments assessed as investment grade, percent 61.10% 92.60%
Trade receivables $ 918,400 $ 950,600
Financing Receivables, Equal to Greater than 1 Day Past Due | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 36,600 86,300
Allowance for doubtful account 10,500 13,000
Performing Financial Instruments | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 892,300 877,200
Performance Guarantee | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 1,300 3,400
Credit Insurance | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables 422,800 469,300
Guarantee Type, Other | Credit risk    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 7,300 $ 16,400