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FINANCIAL INSTRUMENTS FINANCIAL INSTRUMENTS (Fair Value and Carrying Value) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Corporate Bond Securities [Member] |  |
Derivative [Line Items] |  |
Available-for-sale Securities | $ 14,221 | $ 13,245
Estimate of Fair Value Measurement [Member] |  |
Derivative [Line Items] |  |
Available-for-sale Securities | 14,221 | 13,245
Equity Securities, FV-NI | 101,337 | 73,929
Floating rate NOK bonds due 2019 | 0 | 77,916
Swap contracts short term receivables fair value disclosure | 0 | 5,279
Swap contracts, long term receivables, fair value disclosure | 2,597 | 10,633
Swap Contracts, Short Term Payables, Fair Value Disclosure | 4,390 | 45,047
Swap contracts, long term payables, fair value disclosure | 16,713 | 16,213
Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Equity Securities, FV-NI | 101,337 | 73,929
Floating rate NOK bonds due 2019 | 0 | 77,722
Swap contracts short term receivables fair value disclosure | 0 | 5,279
Swap contracts, long term receivables, fair value disclosure | 2,597 | 10,633
Swap Contracts, Short Term Payables, Fair Value Disclosure | 4,390 | 45,047
Swap contracts, long term payables, fair value disclosure | 16,713 | 16,213
NOK500million senior unsecured floating rate bonds due 2020 [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative [Line Items] |  |
Floating Rate NOK Bonds due 2020 | 60,368 | 58,841
NOK500million senior unsecured floating rate bonds due 2020 [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Floating Rate NOK Bonds due 2020 | 58,582 | 57,829
NOK600million senior unsecured floating rate bonds due 2023 [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative [Line Items] |  |
Floating rate NOK bonds due 2023 | 70,562 | 69,568
NOK600million senior unsecured floating rate bonds due 2023 [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Floating rate NOK bonds due 2023 | 70,298 | 69,395
NOK700million senior unsecured floating rate bonds due 2024 [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative [Line Items] |  |
Floating Rate NOK Bonds due 2024 | 82,014 | 0
NOK700million senior unsecured floating rate bonds due 2024 [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Floating Rate NOK Bonds due 2024 | 82,014 | 0
Senior Unsecured Convertible Bonds due 2021 [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 213,822 | 199,496
Senior Unsecured Convertible Bonds due 2021 [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 212,230 | 212,230
Senior Unsecured Convertible Bonds due 2023 [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 149,819 | 139,374
Senior Unsecured Convertible Bonds due 2023 [Member] | Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Convertible Debt, Fair Value Disclosures | $ 148,300 | $ 151,700

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