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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

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