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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Oct. 01, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowances for doubtful accounts and sales returns $ 10,065 $ 7,496
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 158,565,000 157,677,000
Common stock, shares outstanding 80,561,000 81,472,000
Treasury stock, shares 78,004,000 76,205,000