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FINANCIAL INSTRUMENTS (Fair Value Hierarchy) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets:    
Available for sale securities $ 61,889 $ 76,925
Recurring Basis [Member]
    
Assets:    
Available for sale securities 61,889  
Interest rate/currency swap contracts - long term receivables 7,320  
Total assets 69,209  
Liabilities:    
Floating rate NOK bonds due 2017 97,152  
Floating rate NOK bonds due 2019 145,387  
Swap Contracts, Short Term Payable, Fair Value Disclosure 2,568  
Interest rate/ currency swap contracts – long-term payables 59,980  
Total liabilities 839,201  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Basis [Member]
    
Assets:    
Available for sale securities 39,811  
Total assets 39,811  
Liabilities:    
Floating rate NOK bonds due 2017 97,152  
Floating rate NOK bonds due 2019 145,387  
Total liabilities 776,653  
Significant Other Observable Inputs (Level 2) [Member] | Recurring Basis [Member]
    
Assets:    
Interest rate/currency swap contracts - long term receivables 7,320  
Total assets 7,320  
Liabilities:    
Swap Contracts, Short Term Payable, Fair Value Disclosure 2,568  
Interest rate/ currency swap contracts – long-term payables 59,980  
Total liabilities 62,548  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Basis [Member]
    
Assets:    
Available for sale securities 22,078  
Total assets 22,078  
Liabilities:    
Total liabilities 0  
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member]
    
Liabilities:    
Stated interest rate 3.75%  
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | Recurring Basis [Member]
    
Liabilities:    
Unsecured convertible bonds 135,516  
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Basis [Member]
    
Liabilities:    
Unsecured convertible bonds 135,516  
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 398,598  
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 $ 398,598