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SHAREHOLDERS' EQUITY - Preferred Stock (Details) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Preferred Stock    
Preferred stock shares authorized 10,000,000 10,000,000
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock shares issued 0 0
Preferred stock shares outstanding 0 0
Preferred Stock    
Preferred Stock    
Preferred stock shares authorized 10,000,000 10,000,000
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock shares issued 0 0
Preferred stock shares outstanding 0 0