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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS    
Common Stock, par value (in dollars per share) $ 0.01 $ 0.01
Common Stock, shares authorized 200,000,000 200,000,000
Common Stock, shares issued 22,700,991 22,590,897
Common Stock, shares outstanding 22,700,991 22,590,897