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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Shareholders' equity    
Share capital, par value (in dollars per share) $ 0.01 $ 0.01
Share capital, shares authorized 100,000,000 100,000,000
Share capital, shares issued 33,828,251 32,354,634
Share capital, shares outstanding 33,828,251 32,354,634
Treasury stock, shares 3,777,087 4,365,306