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Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Common stock, par value (usd per share) $ 0.01 $ 0.01
Treasury stock, par value (usd per share) 0.01 0.01
Common Stock    
Common stock, par value (usd per share) 0.01 0.01
Treasury Stock    
Treasury stock, par value (usd per share) $ 0.01 $ 0.01