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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Shareholders' equity    
Share capital, par value (in dollars per share) $ 0.01  
Share capital, shares authorized 100,000,000 100,000,000
Share capital, shares issued 35,381,474 35,146,982
Share capital, shares outstanding 35,381,474 35,146,982
Treasury stock, shares 3,742,219 (3,323,262)