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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 25,047,000 25,047,000
Treasury stock, shares (in shares) 5,344,000 3,977,000