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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Preferred stock, par value per share $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, par value per share $ 0.01 $ 0.01
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 157,677,000 156,716,000
Common stock, shares outstanding 81,472,000 83,147,000
Treasury stock, shares 76,205,000 73,569,000