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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

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