Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Allowances for doubtful accounts and sales returns	$ 6,343	$ 8,584
Stockholders' equity:
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	153,449,000	152,757,000
Common stock, shares outstanding	87,663,000	88,996,000
Treasury stock, shares	65,786,000	63,761,000