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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 80,000,000 80,000,000
Common stock, shares issued 25,851,442 25,703,490
Treasury stock, shares 8,025,339 7,625,339