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FINANCIAL INSTRUMENTS FINANCIAL INSTRUMENTS (Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Measurements, Recurring [Member] |  |
Derivative [Line Items] |  |
Available-for-sale Securities | $ 14,221 |
Equity Securities, FV-NI | 101,337 |
Swap contracts, long term receivables, fair value disclosure | 2,597 |
Assets, Fair Value Disclosure | 118,155 |
Floating Rate NOK Bonds due 2020 | 60,368 |
Floating rate NOK bonds due 2023 | 70,562 |
Floating Rate NOK Bonds due 2024 | 82,014 |
Fair value of convertible bonds due 2021 | 213,822 |
Fair value of convertible bonds due 2023 | 149,819 |
Swap Contracts, Short Term Payable, Fair Value Disclosure | 4,390 |
Swap contracts, long term payables, fair value disclosure | 16,713 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 597,688 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivative [Line Items] |  |
Available-for-sale Securities | 14,221 |
Equity Securities, FV-NI | 101,337 |
Assets, Fair Value Disclosure | 115,558 |
Floating Rate NOK Bonds due 2020 | 60,368 |
Floating rate NOK bonds due 2023 | 70,562 |
Floating Rate NOK Bonds due 2024 | 82,014 |
Fair value of convertible bonds due 2021 | 213,822 |
Fair value of convertible bonds due 2023 | 149,819 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 576,585 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivative [Line Items] |  |
Assets, Fair Value Disclosure |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivative [Line Items] |  |
Swap contracts, long term receivables, fair value disclosure | 2,597 |
Assets, Fair Value Disclosure | 2,597 |
Swap Contracts, Short Term Payable, Fair Value Disclosure | 4,390 |
Swap contracts, long term payables, fair value disclosure | 16,713 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 21,103 |
Senior Unsecured Convertible Bonds due 2021 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivative [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |
Senior Unsecured Convertible Bonds due 2023 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivative [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% |
Reported Value Measurement [Member] |  |
Derivative [Line Items] |  |
Equity Securities, FV-NI | $ 101,337 | $ 73,929
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, long term payables, fair value disclosure | $ 16,713 | $ 16,213
Reported Value Measurement [Member] | Senior Unsecured Convertible Bonds due 2021 [Member] |  |
Derivative [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |
Reported Value Measurement [Member] | Senior Unsecured Convertible Bonds due 2023 [Member] |  |
Derivative [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% |

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