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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Stockholders' equity        
Share capital, par value (in dollars per share) $ 1.00 $ 1.00    
Share Capital, shares authorized 125,000,000 125,000,000    
Share Capital, shares issued 93,359,000 93,260,000    
Share Capital, shares outstanding 93,359,000 93,260,000 93,260,000 85,225,000