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FINANCIAL INSTRUMENTS (Fair Value Hierarchy) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Assets:    
Available-for-sale Securities $ 119,975 $ 199,594
Recurring Basis [Member]    
Assets:    
Available-for-sale Securities 119,975  
Interest rate/currency swap contracts - long term receivables 0  
Total assets 119,975  
Liabilities:    
Floating rate NOK bonds due 2017 66,006  
Floating rate NOK bonds due 2019 83,170  
Interest rate/ currency swap contracts – long-term payables 129,165  
Total liabilities 650,846  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Basis [Member]    
Assets:    
Available-for-sale Securities 119,975  
Total assets 119,975  
Liabilities:    
Floating rate NOK bonds due 2017 66,006  
Floating rate NOK bonds due 2019 83,170  
Total liabilities 521,681  
Significant Other Observable Inputs (Level 2) [Member] | Recurring Basis [Member]    
Assets:    
Interest rate/currency swap contracts - long term receivables 0  
Total assets 0  
Liabilities:    
Interest rate/ currency swap contracts – long-term payables 129,165  
Total liabilities 129,165  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Basis [Member]    
Assets:    
Available-for-sale Securities 0  
Total assets 0  
Liabilities:    
Total liabilities $ 0  
Senior Unsecured Convertible Bonds Due 2018 [Member]    
Liabilities:    
Stated interest rate 3.25%  
Senior Unsecured Convertible Bonds Due 2018 [Member] | Recurring Basis [Member]    
Liabilities:    
Unsecured convertible bonds $ 372,505  
Senior Unsecured Convertible Bonds Due 2018 [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Basis [Member]    
Liabilities:    
Unsecured convertible bonds $ 372,505