Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowances for accounts receivable	$ 20,492	$ 13,104
Equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred Stock Authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common Stock Authorized	575,000,000	575,000,000
Common Stock Issued	484,115,095	482,164,353
Treasury stock, shares	24,105,109	11,776,036