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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%