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FINANCIAL INSTRUMENTS (Fair Value and Carrying Value) (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Non-derivatives:    
Available for sale securities $ 61,889,000 $ 76,925,000
Carrying Value [Member]
    
Non-derivatives:    
Available for sale securities 61,889,000 76,925,000
Floating rate NOK bonds due 2014 0 71,854,000
Floating rate NOK bonds due 2017 93,231,000 92,483,000
Floating rate NOK bonds due 2019 145,388,000 0
Derivatives:    
Interest rate/ currency swap contracts – long-term receivables 7,320,000 16,633,000
Interest rate/ currency swap contracts – short-term payables 2,568,000 5,705,000
Interest rate/ currency swap contracts – long-term payables 59,980,000 56,490,000
Fair Value [Member]
    
Non-derivatives:    
Available for sale securities 61,889,000 76,925,000
Floating rate NOK bonds due 2014 0 72,032,000
Floating rate NOK bonds due 2017 97,152,000 93,752,000
Floating rate NOK bonds due 2019 145,387,000 0
Derivatives:    
Interest rate/ currency swap contracts – long-term receivables 7,320,000 16,633,000
Interest rate/ currency swap contracts – short-term payables 2,568,000 5,705,000
Interest rate/ currency swap contracts – long-term payables 59,980,000 56,490,000
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | Carrying Value [Member]
    
Non-derivatives:    
Unsecured convertible bonds 125,000,000 125,000,000
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | Fair Value [Member]
    
Non-derivatives:    
Unsecured convertible bonds 135,516,000 130,589,000
Senior Unsecured Convertible Bonds Due 2018 [Member] | Carrying Value [Member]
    
Non-derivatives:    
Unsecured convertible bonds 350,000,000 350,000,000
Senior Unsecured Convertible Bonds Due 2018 [Member] | Fair Value [Member]
    
Non-derivatives:    
Unsecured convertible bonds 398,598,000 359,307,000
Not Designated as Hedging Instrument [Member]
    
Derivatives:    
Long term receivables, non-designated swap contracts 6,700,000 10,100,000
Short term payables, non-designated swap contracts 600,000 100,000
Long term payables, non-designated swap contracts $ 2,300,000 $ 3,600,000