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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 51,055,000 50,288,000
Common stock, shares outstanding 47,133,000 46,877,000
Treasury stock, shares 3,922,000 3,411,000