CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2010	Dec. 31, 2009
Accounts receivable, allowance (in dollars)	$ 8,848	$ 10,515
Treasury stock, shares	153,663,130	117,883,689
Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	1,600,000,000	1,600,000,000
Common stock, issued shares	225,873,751	222,657,925
Common stock, outstanding shares	84,078,621	108,131,736
Class B Convertible Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	400,000,000	400,000,000
Common stock, issued shares	16,157,499	16,157,499
Common stock, outstanding shares	4,289,499	12,799,999