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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock shares authorized (in shares) 10,000,000 10,000,000
Preferred stock shares issued (in shares) 0 0
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (in shares) 300,000,000 300,000,000
Common stock shares issued (in shares) 84,071,000 83,970,000
Treasury stock (in shares) 0 11,000