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FINANCIAL INSTRUMENTS (Fair Value and Carrying Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Non-derivatives:    
Available-for-sale Securities $ 119,975 $ 199,594
Carrying Value [Member]    
Non-derivatives:    
Available-for-sale Securities 119,975 199,594
Floating rate NOK bonds due 2017 67,368 63,681
Floating rate NOK bonds due 2019 90,380 85,434
Derivatives:    
Interest rate/ currency swap contracts – long-term receivables 0 800
Interest rate/ currency swap contracts – long-term payables 129,165 113,642
Fair Value [Member]    
Non-derivatives:    
Available-for-sale Securities 119,975 199,594
Floating rate NOK bonds due 2017 66,006 63,719
Floating rate NOK bonds due 2019 83,170 79,549
Derivatives:    
Interest rate/ currency swap contracts – long-term receivables 0 800
Interest rate/ currency swap contracts – long-term payables 129,165 113,642
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | Carrying Value [Member]    
Non-derivatives:    
Unsecured convertible bonds 0 117,500
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | Fair Value [Member]    
Non-derivatives:    
Unsecured convertible bonds 0 118,021
Senior Unsecured Convertible Bonds Due 2018 [Member] | Carrying Value [Member]    
Non-derivatives:    
Unsecured convertible bonds 350,000 350,000
Senior Unsecured Convertible Bonds Due 2018 [Member] | Fair Value [Member]    
Non-derivatives:    
Unsecured convertible bonds 372,505 378,315
Not Designated as Hedging Instrument [Member]    
Derivatives:    
Long term receivables, non-designated swap contracts 0 300
Long term payables, non-designated swap contracts $ 23,800 $ 14,500